Lenk, J.
The defendant appeals from his convictions of two counts of rape of a child under sixteen years of age, G. L. c. 265, § 23, and two counts of indecent assault and battery on a person who has attained the age of fourteen years, G. L. c. 265, § 13H. The defendant contends, among other claims, that certain statements admitted against him at trial were obtained in violation of his right to counsel under the Fifth Amendment to the United States Constitution, as interpreted by
Miranda
v.
Arizona,
384 U.S. 436 (1966)
(Miranda).
During custodial interrogation, after being given Miranda warnings, the defendant told police, “I’d like an attorney present. I mean but I can’t afford one. So I guess I’ll speak to you now. I don’t have an attorney.” Immediately thereafter, and without counsel present, the defendant had further discussion with the officers, signed a written waiver of Miranda rights, continued to be questioned, and made inculpatory statements that he was later unsuccessful in attempting to suppress.
We granted the defendant’s application for direct appellate review to consider whether, in making the above-quoted statement at the outset of questioning, the defendant invoked his Fifth Amendment right to counsel. We conclude that the defendant unambiguously invoked his right to counsel and that questioning should have ceased until counsel was made available. Therefore, the incriminating statements should not have been admitted at trial. In any event, the defendant is entitled to relief because the Commonwealth did not satisfy its heavy burden of establishing beyond a reasonable doubt that the defendant’s subsequent waiver of that right was knowing, voluntary, and intelligent. See
Commonwealth
v.
Day,
387 Mass. 915, 920-921 (1983). Because we cannot conclude that the erroneous admission of the defendant’s statements was harmless beyond a reasonable doubt, a new trial is required.
Background.
We summarize the procedural backdrop as well as relevant facts as the jury could have found them, reserving certain details for later discussion.
The complainant was bom on September 20, 1990. After the death of his father in October, 2003, the complainant began attending Native American gatherings with his mother, who had been involved previously in the local Native American community. The complainant and his mother met the defendant at one such
gathering in the spring of 2004. The complainant purchased a rabbit from the defendant and subsequently began visiting the defendant’s house to help take care of the defendant’s many animals. Although at first his mother went to the defendant’s house with him, the complainant was eventually allowed to visit the defendant by himself.
The complainant testified to a pattern of sexual conduct between himself and the defendant that began at this time. Specifically, he testified to incidents in which the defendant and the complainant would engage in sexualized touching. By November of 2005, the conduct escalated when the complainant and the defendant began to engage in oral sex. The defendant provided the complainant with alcohol and marijuana when they had sex. The complainant testified further that at all times during this relationship he did not want to engage in any sexual acts with the defendant, but that he acquiesced out of fear for his mother’s safety, even though the defendant had never threatened either the complainant or his family.
In the spring of 2007, the complainant spoke to someone for the first time about the nature of his encounters with the defendant, confiding in a Native American elder who had been teaching him about that culture. Soon thereafter, the complainant told his mother about his encounters with the defendant. To help in proving that the defendant had engaged in these acts, the complainant and his mother decided to make an audio recording of a conversation between the complainant and the defendant discussing the sexual conduct. After making this recording, the complainant’s mother filed a complaint with the Pittsfield police department; the complaint was investigated by Detective Dale Eason. After further investigation — including listening to the audio recording and speaking with the complainant, his mother, and the elder — Eason arrested the defendant.
Eason and Pittsfield police Sergeant Marc Strout questioned the defendant at the police station after his arrest. Eason started the interrogation by reviewing the Miranda waiver form with the defendant.
Although the defendant did not have his reading glasses, he gave his signed permission for the interrogation to
be videorecorded.
After Eason read the defendant the Miranda warnings,
the following exchange took place:
Eason: “This right here states that you understood everything I just read to you. Having these rights in mind, do you wish to speak to us now?”
Defendant: “I’d like an attorney present. I mean but I can’t afford one. So I guess I’ll just speak to you now. I don’t have an attorney.”
Eason: “Okay. If you want to speak to us later, that’s fine as well. I mean but we’re not, you know, we don’t get you an attorney, we can let you use a phone book and stuff like that, but it’s up to you.”
Defendant: “I’ll just talk to you now.”
Eason: “Okay.”
Strout: “Roy, I just want to make it clear. You want to talk to us now, and you don’t want an attorney?”
Defendant: “Uh, I’d have to wait here until an attorney came right?”
Strout: “You can ... we can let you use the phone and the phone book to call an attorney. I can’t tell you if they’re gonna come here, I don’t know what they would do.”
Defendant: “I’ll just talk to you without an attorney.”
Thereafter, the defendant signed the form, waiving his rights under
Miranda,
and made inculpatory statements.
On June 14, 2007, the defendant was indicted for rape of a child by force, G. L. c. 265, § 22A; assault with intent to commit rape and rape, G. L. c. 265, § 22
(b);
indecent assault and battery on a child under fourteen, G. L. c. 265, § 13B; and indecent assault and battery on a person who has attained the age of fourteen, G. L. c. 265, § 13H.
The defendant filed a pretrial motion to suppress incriminating statements made during the police interrogation.
After an evidentiary hearing, a Superior Court judge denied the motion. Having viewed the video recording of the interrogation, the judge concluded that suppression was not required because there had been no “unequivocal invocation” of the right to counsel.
After a four-day trial before a different Superior Court judge, during which the entire interrogation video recording was admitted in evidence and played for the jury,
the defendant was found guilty of two counts of rape of a child and two counts of indecent assault and battery.
On appeal, the defendant claims error in three respects. First, he contends that the judge erred in allowing the admission of his incriminating statements obtained in violation of
Miranda,
arguing both that he invoked his right to counsel at the start of the interrogation and that his waiver was invalid. Second, the defendant argues that the judge erred in admitting in evidence testimony as to multiple first complaints, thereby giving rise to a substantial risk of a miscarriage of justice. Finally, the defendant argues that he was deprived of his right to the effective assistance of counsel.
Discussion,
a.
Motion to suppress incriminating statements in violation of
Miranda, i.
Standard of review.
In reviewing a ruling on a motion to suppress, “[w]e accept the judge’s subsidiary findings absent clear error but conduct an independent review of his ultimate findings and conclusions of law.”
Commonwealth
v.
Bostock,
450 Mass. 616, 619 (2008), quoting
Commonwealth
v.
Jimenez,
438 Mass. 213, 218 (2002). “[Ojur duty is to make an independent determination of the correctness of the judge’s application of constitutional principles to the facts as found.”
Commonwealth
v.
Bostock, supra
at 619, quoting
Commonwealth
v.
Mercado,
422 Mass. 367, 369 (1996). Deference as to a motion judge’s factual findings is generally appropriate because “[t]he judge determines the weight and credibility of the testimony” taken at the evidentiary hearing on the motion to suppress.
Commonwealth
v.
Scott,
440 Mass. 642, 646 (2004).
Here, however, the motion judge heard no such testimony. At the evidentiary hearing, he considered only documentary evidence: the Miranda waiver form, the interrogation video recording, and the transcript of the interrogation. We have all of these materials before us. We are thus “in the same position as the motion judge in viewing the videotape” as well as the other evidence submitted to him.
Commonwealth
v.
Prater,
420 Mass. 569, 578 n.7 (1995). In such cases, “[w]e have consistently held that lower court findings based on documentary evidence available to an appellate court are not entitled to deference.”
Commonwealth
v.
Novo,
442 Mass. 262, 266 (2004). “[W]e
will ‘take an independent view’ of recorded confessions and make judgments with respect to their contents without deference to the fact finder, who ‘is in no better position to evaluate the[ir] content and significance.’ ”
Id.,
quoting
Commonwealth
v.
Bean,
435 Mass. 708, 714 n.15 (2002).
ii.
Invocation of the Fifth Amendment right to counsel.
The Fifth Amendment provides that “[n]o person . . . shall be compelled in any criminal case to be a witness against himself.” The United States Supreme Court recognized in
Miranda, supra,
that this protection against compelled self-incrimination must extend to police custodial interrogations because “without proper safeguards the process of in-custody interrogation of persons suspected or accused of crime contains inherently compelling pressures which work to undermine the individual’s will to resist and to compel him to speak where he would not otherwise do so freely.”
Miranda, supra
at 467. In light of these pressures, in circumstances of custodial interrogation,
“[pjrior to any questioning, the [suspect] must be warned that he has a right to remain silent, that any statement he does make may be used as evidence against him, and that he has a right to the presence of an attorney, either retained or appointed.”
Id.
at 444. “[A] warning at the time of the interrogation is indispensable to overcome its pressures and to insure that the individual knows he is free to exercise the privilege at that point in time.”
Id.
at 469. A defendant’s statements may not be placed before a jury unless the Commonwealth proves beyond a reasonable doubt that, after having been advised of these rights, the defendant gave a knowing, voluntary, and intelligent waiver of them.
Commonwealth
v.
Day,
387 Mass. 915, 920-921 (1983). If, on the other hand, the defendant invokes his right to counsel, all interrogation must cease until counsel is made available, unless the defendant himself reinitiates further communication with the police. See
Edwards
v.
Arizona,
451 U.S.
477,
484-485 (1981).
In deciding whether a defendant has invoked the Fifth Amendment right to counsel, the United States Supreme Court has
stated that “after a knowing and voluntary waiver of the Miranda rights, law enforcement officers may continue questioning until and unless the suspect clearly requests an attorney.”
Davis
v.
United States,
512 U.S. 452, 461 (1994)
(Davis).
This post-waiver test requires that the invocation be a sufficiently clear statement such “that a reasonable police officer in the circumstances would understand the statement to be a request for an attorney.”
Id.
at 459. The United States Supreme Court has recently imported the
Davis
rule requiring heightened clarity into the context of a prewaiver invocation of the right to remain silent, see
Berghuis
v.
Thompkins,
130 S. Ct. 2250, 2260 (2010), and the Commonwealth contends that the test in
Davis
now extends to prewaiver invocations of the right to counsel.
The defendant maintains that even if this is the case, he unambiguously invoked his right to counsel such that a reasonable police officer would understand the statement to be a request for an attorney.
We disagree with the motion judge’s conclusion that the defendant’s statement was ambiguous. In these circumstances, the statement, “I’d like an attorney present,” in response to the question, “Do you wish to speak to us now?” was an unambiguous invocation of the defendant’s right to counsel. We have reached the same conclusion with respect to statements displaying with even less clarity a defendant’s desire for counsel. See, e.g.,
Commonwealth
v.
Contos,
435 Mass. 19, 29-30 (2001) (“I think I’m going to get a lawyer” constituted unambiguous invocation of right to counsel). The defendant here was not
“musing about the possibility of stopping the questioning until he has spoken with an attorney.”
Commonwealth
v.
Morganti,
455 Mass. 388, 397-398 (2009)
(Morganti),
and cases cited (statement “I
might
need a lawyer and want to talk with him before talking to you” did not unambiguously invoke right to counsel [emphasis added]). Unlike in
Morganti,
where the defendant’s isolated statement occurred in the middle of interrogation, the defendant here stated explicitly, before questioning was under way, and in response to a direct question concerning his desire to invoke his right to counsel, that he wanted an attorney present.
Furthermore, the defendant’s statement was not merely an “acknowledgment of the serious nature of the charges facing him,”
Commonwealth
v.
Pennellatore, 392
Mass. 382, 387 (1984), since the defendant actually said that he would like an attorney present for questioning rather than simply stating that he would need an attorney at some point in the future. Contrast
id.
(defendant’s statement, “I guess I’ll have to have a lawyer for this,” was, viewed in context, recognition of seriousness of charges rather than affirmative request for attorney). The defendant’s statement here unambiguously reflected a desire to have counsel present during questioning. His difficulty was that he could not afford an attorney. Where a suspect invokes his right to counsel but notes that he cannot afford counsel, the latter observation does not render the request for counsel equivocal. Because
Miranda
requires that a suspect who cannot afford an attorney will have one provided for him, indigence cannot be a ground on which to find equivocation.
When a defendant invokes his right to counsel, all subsequent statements are inadmissible unless counsel is provided or the Commonwealth can prove beyond a reasonable doubt that the defendant “initiatefd] further communication, exchanges, or conversations with the police,”
Edwards
v.
Arizona, supra
at 485, and thereby waived his right to counsel.
Commonwealth
v.
Rankins,
429 Mass. 470, 473 (1999). Here, because the officers initiated further questioning of the defendant after his unambiguous invocation of the right to counsel, the defendant’s subsequent statements must be suppressed.
iii.
Waiver of right to counsel under State law.
The Com
monwealth contends, however, that, when read in its entirety, the defendant’s initial invocation of his right to counsel (“I’d like an attorney present”) was rendered ambiguous by what he said immediately thereafter (“I mean but I can’t afford one. So I guess I’ll just speak to you now. I don’t have an attorney”). In so arguing, the Commonwealth ignores the long-standing principle that “postrequest responses to further interrogation may not be used to cast retrospective doubt on the clarity of the initial request itself.”
Smith
v.
Illinois,
469 U.S. 91, 100 (1984). However, even if we agreed with the Commonwealth’s contention, assumed that the
Davis
heightened clarity requirement was applicable to prewaiver invocations of the right to counsel, and determined that the invocation did not satisfy the
Davis
rule, the defendant’s inculpatory statements would nevertheless require suppression. Because these subsequent statements demonstrated the defendant’s clear ignorance of his right to appointed counsel, the Commonwealth cannot meet its burden of establishing a knowing, voluntary, and intelligent waiver of that right beyond a reasonable doubt. The invalidity of the defendant’s waiver requires that, regardless of the clarity of his invocation of the right to counsel, his inculpatory statements must be suppressed.
The rule in
Miranda
— establishing a presumption of coercion in the absence of the required warnings — “protects both Fifth Amendment rights and rights guaranteed under art. 12 [of the Massachusetts Declaration of Rights].”
Commonwealth
v.
Martin,
444 Mass. 213, 218 (2005). For any statement made during custodial interrogation to be admissible against the defendant at trial, both the Federal and State constitutions require that the prosecution prove that the defendant waived these rights before making the statement. See
Commonwealth
v.
Edwards,
420 Mass. 666, 669-670 (1995), citing
Miranda, supra.
It is a particularly heavy burden that the Commonwealth bears in proving such waiver,
Commonwealth
v.
Dustin,
373 Mass. 612, 614 (1977), quoting
Miranda, supra
at 475, because in Massachusetts proof of a valid waiver must be shown beyond a reasonable doubt.
Commonwealth
v.
Day,
387 Mass. 915, 920-921 (1983). Contrast
Colorado
v.
Connelly,
479 U.S. 157, 168
(1986), and cases cited (requiring, as matter of Federal law, proof of waiver only by “preponderance of the evidence”). Indeed, we “ ‘indulge every reasonable presumption against waiver of fundamental constitutional rights’ . . . including the right against self-incrimination.”
Commonwealth
v.
Simon,
456 Mass. 280, 305-306 (2010) (Botsford, J., dissenting), quoting
Commonwealth
v.
White,
374 Mass. 132, 137 (1977), aff’d (by an equally divided Court), 439 U.S. 280 (1978).
As stated, “[t]o be valid the waiver must be made voluntarily, knowingly, and intelligently.”
Commonwealth
v.
Edwards, supra
at 670. “The question is not one of form, but rather whether the defendant
in fact
knowingly and voluntarily waived the rights delineated in the
Miranda
case” (emphasis supplied).
North Carolina
v.
Butler,
441 U.S. 369, 373 (1979). “A confession can be voluntary in the legal sense only if the suspect actually understands the import of each Miranda warning,”
Commonwealth
v.
Garcia,
379 Mass. 422, 429 (1980), and is not “threatened, tricked, or cajoled into a waiver.”
Miranda, supra
at 476. In deciding whether a defendant’s waiver of the rights described in the Miranda warning is valid, “a court must examine the totality of the circumstances, including the characteristics of the accused and the details of the interrogation.”
Commonwealth
v.
Silva,
388 Mass. 495, 501 (1983).
Where, as here, the defendant manifestly did not understand the meaning of one or more of the rights described in the Miranda warnings, the Commonwealth cannot meet its burden of proving a valid waiver beyond a reasonable doubt.
Miranda
requires a warning that a suspect not only has a right to consult with an attorney, but also that “if he cannot afford an attorney one will be appointed for him prior to any questioning if he so desires.”
Miranda, supra
at 479. “Without this additional warning, the admonition of the right to consult with counsel would often be understood as meaning only that [a suspect] can consult with a lawyer if he has one or has the funds to obtain one.”
Id.
at 473. Although he received the full Miranda warnings, the defendant was under just such a misapprehension. In his statements to the police after the Miranda warnings were read, the defendant not only demonstrated a desire to invoke his right to appointed counsel, but also showed a clear ignorance of the meaning of
that right. Any arguable ambiguity in the defendant’s invocation was a product of this fundamental misunderstanding of his right to appointed counsel. Because a knowing waiver requires that a “defendant must understand ‘the [Miranda] warnings themselves,’ ”
Commonwealth
v.
Hilton,
443 Mass. 597, 606 (2005), quoting
Commonwealth
v.
Raymond,
424 Mass. 382, 393 (1997), the defendant’s misunderstanding of his right to appointed counsel means that his statements must be suppressed.
This misunderstanding was exacerbated by what might have been an effort on the part of the police to clarify the defendant’s statements. By twice offering the defendant a telephone book so that he could call an attorney, and telling the defendant that “we don’t get you an attorney,” and “I can’t tell you if they’re gonna come here, I don’t know what they would do,” however, Strout and Eason were not in fact clarifying matters. Their efforts only made the situation worse by effectively emphasizing the option the defendant could not pursue (a private attorney) while obscuring the option in which the defendant had expressed interest and to which he had a right (an appointed attorney). In any event, the officers did not correct the defendant’s manifest misunderstanding of his right to appointed counsel, and as a result the Commonwealth cannot prove beyond a reasonable doubt that the defendant waived his Miranda rights knowingly, voluntarily, and intelligently. His inculpatory statements should thus not have been admitted at trial.
iv.
Whether the error was prejudicial.
Given this error, we must determine whether the admission of the defendant’s statements requires a new trial. Although the defendant failed to renew his objection at trial after the motion judge denied his pretrial motion to suppress, “[t]he denial of a motion to suppress evidence on constitutional grounds ... is reviewable without further objection at trial.”
Commonwealth
v.
Whelton,
428 Mass. 24, 25-26 (1998), and cases cited. The question thus becomes whether the admission of the defendant’s statements was harmless beyond a reasonable doubt. See
Commonwealth
v.
Ghee,
414 Mass. 313, 318-319 (1993). To answer that question, “we analyze the case to see whether the error might have had an effect on the jury or contributed to the verdicts, and whether the Commonwealth’s evidence was ‘ “merely cumulative” of
evidence properly before the jury,’ ... or was overwhelming without the erroneously admitted evidence.”
Commonwealth
v.
Dagraca,
447 Mass. 546, 553 (2006), quoting
Commonwealth
v.
Sinnott,
399 Mass. 863, 872 n.8 (1987).
The Commonwealth bears the burden of demonstrating that an error was harmless beyond a reasonable doubt.
Commonwealth
v.
Tyree,
455 Mass. 676, 701 (2010). We consider a number of factors in deciding whether the Commonwealth has met its burden: “the importance of the evidence in the prosecution’s case; the relationship between the evidence and the premise of the defense; who introduced the issue at trial; the frequency of the reference; whether the erroneously admitted evidence was merely cumulative of properly admitted evidence; the availability or effect of curative instructions; and the weight or quantum of evidence of guilt.”
Commonwealth
v.
Dagraca, supra
at 553, citing
Commonwealth
v.
Vasquez,
456 Mass. 350, 360 n.12 (2010). Although these factors guide our review, “there is no uniform standard for all cases; the results of our review are determined by the circumstances of each case.”
Commonwealth
v.
Mahdi,
388 Mass. 679, 697 (1983).
Here, the erroneous admission of the defendant’s incriminating statements was not harmless. The defendant’s theory of the case, at least once it was known that his inculpatory statements had not been suppressed, was that the consensual sexual contact occurred only after the complainant reached the age of fourteen, and consensual intercourse began only after the complainant reached age sixteen. Other than the complainant’s testimony, the defendant’s erroneously admitted statements were the only evidence of prior sexual contact or intercourse between the defendant and the complainant.
The recording of the interrogation was played for the jury during trial and was available to them during deliberations. During the interrogation, the defendant not only admitted to engaging in oral sex with the complainant on three occasions, but also changed his story throughout the interrogation, thereby “increas[ing] the likelihood that the jury would view the defendant as a liar, a man who would change his story in order to avoid responsibility for his crimes.”
Commonwealth
v.
Mc-Nulty,
458 Mass. 305, 322 (2010) (concluding that such evidence
was not harmless beyond reasonable doubt). Furthermore, the prosecutor referred to the defendant’s statements repeatedly in both her opening statement and closing argument. See
Commonwealth
v.
Tyree, supra
at 703 (tainted evidence was not harmless beyond reasonable doubt because “repeated emphasis on the improperly admitted evidence in the prosecutor’s closing argument . . . reflects the centrality of that evidence to the Commonwealth’s case”).
Because the unlawful evidence “contributed to or might have contributed to the verdicts,”
Commonwealth
v.
Molina,
439 Mass. 206, 212 (2003), quoting
Commonwealth
v.
Perrot,
407 Mass. 539, 549 (1990), a new trial is mandated.
b.
First complaint evidence.
We address briefly the defendant’s claim of first complaint error in the event that it arises on retrial.
See
Commonwealth
v.
King,
445 Mass. 217, 243 (2005), cert. denied, 546 U.S. 1216 (2006) (King);
Commonwealth
v.
McGee,
75 Mass. App. Ct. 499, 502 (2009).
The defendant contends that it was error to allow multiple first complaint testimony. The complainant, his mother, and Eason testified variously as to the complainant’s disclosures to the elder and to his mother, and as to the investigative process itself, notwithstanding the undisputed fact that it was the elder to whom the complainant first complained. The elder did not testify. The defendant contends that only the complainant’s disclosures to the elder were admissible as first complaint testimony and then only if the elder testified as a first complaint witness. The defendant asserts that the complainant’s disclosure to his mother would be admissible as first complaint testimony only if the judge had designated her as a substitute first complaint witness. The defendant maintains also that, insofar as Eason’s testimony as to statements by the complainant, his mother, and the elder, as well as about the investigative process itself, was admitted as first complaint, it was admitted in error.
The first complaint doctrine prohibits introduction of testimony from more than one witness concerning a victim’s reports of a sexual assault, “limiting [such] testimony to that of. . . the first person told of the assault.”
King, supra.
In limited cir
cumstances, however, a judge may permit the testimony of a complaint witness other than the individual to whom the victim first disclosed the assault.
First complaint testimony is admissible only where “the fact of the assault or the issue of consent is contested.”
Id.
at 247.
Under the first complaint doctrine, “[l]aw enforcement officials . . . may testify to the complaint only where they are in fact the first to have heard of the assault, and not where they have been told of the alleged crime after previous complaints or after an official report.”
King, supra
at 243.
See
Commonwealth
v.
Monteiro,
75 Mass. App. Ct. 489 (2009).
At any retrial, these considerations must be taken into account. If the elder testifies as the first complaint witness, no other witnesses should testify in that capacity. If the elder does not testify, the complainant may not testify to the fact of his first complaint to the elder or its details, unless the elder is “deceased or the judge determines that there is some other compelling reason for the witness’s absence that is not the fault of the Commonwealth. ’’
King, supra
at 245 n.24. To the extent that the elder is determined by the judge to be “unavailable” or “incompetent [to testify],”
id.
at 243-244, the judge may permit substitute first complaint evidence by the complainant’s mother. In such a circumstance, if the complainant’s mother is substituted as the first complaint witness, the complainant would
not be able to testify either to the fact or to the details of his complaint to the elder.
To the extent first complaint testimony is admitted, appropriate limiting instructions should be given to the jury. Such testimony may be considered only “to establish the circumstances in which the complainant first reported the alleged offense, and then to determine whether that first complaint either supports or fails to support the complainant’s own testimony about the crime,” and the jury “may not consider this testimony as evidence that the assault in fact occurred.”
Id.
at 247-248.
Conclusion.
For the foregoing reasons, the defendant’s convictions are reversed, the verdicts are set aside, and the case is remanded for a new trial in accordance with this opinion.
So ordered.