CARNES, Circuit Judge:
Gerald Anthony Coleman appeals from the district court’s order denying his petition for a writ of habeas corpus pursuant to 28 U.S.C. § 2254. At Coleman’s trial, the evidence against him included statements he made to two detectives shortly after his arrest. On appeal, Coleman raises two issues that merit discussion. First, he contends that the detectives continued to interrogate him after he invoked his Fifth Amendment right to remain silent, and that his subsequent statements were therefore inadmissible. Second, he contends that his waiver of his Miranda rights was ineffective because of his youth and mental illness. For the reasons that follow, we affirm.
[1422]*1422I. BACKGROUND
Coleman was convicted by a Sarasota County jury of the second-degree murder of his ten-year-old sister, a crime committed when he was fifteen years old. He was sentenced to forty years imprisonment. The Second District Court of Appeal affirmed Coleman’s conviction and sentence. Coleman v. State, 515 So.2d 313 (Fla.Dist.Ct.App. 1987). His writ of certiorari to the Supreme Court of Florida was denied. Coleman v. State, 523 So.2d 576 (Fla.1988).
Coleman filed a petition for habeas corpus in the United States District Court for the Middle District of Florida, arguing that his confession was obtained in violation of Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966). The district court denied the petition.
The facts in this case are undisputed. On January 18, 1984, when Coleman returned home from school, he decided to kill his father. He therefore asked his sister to leave the house; she declined to do so and instead went to her bedroom to play with a stuffed animal. Coleman picked up a knife and followed his sister into her bedroom, telling her he was going to kill her. After backing her into a closet with the knife, Coleman strangled her with his hands for a few minutes. She started to breath again after he relaxed his grip, so he strangled her again until his hands grew tired. Then he knotted a belt around her neck. When he was finished, he wrapped her dead body in a blanket and placed it in the closet next to the teddy bear with which she had been playing. He then rode his bicycle to a store where he bought himself candy and a soft drink.
Upon his return, Coleman called a suicide counseling center and reported that he had killed his sister. He then went out again. A police officer found him in the neighborhood, arrested him, and read him the Miranda warnings, after which Coleman told the officer that he had strangled his sister. Coleman was taken to the Sarasota County Sheriffs Office, where he was questioned by Detective Paul Rigney and Detective-Sergeant Dario Valente. Rigney advised Coleman of his Miranda rights again; Coleman responded that he understood his rights and that he was willing to talk; he then confessed for the second time that he had killed his sister.
Rigney and Valente then turned on a tape recorder to record the interrogation. At the beginning of the recorded segment, they informed Coleman of his Miranda rights once more, which was the third time he had heard them that day. Coleman again expressed his willingness to talk, and for the third time confessed that he had strangled his sister. A few minutes later, the interrogation was interrupted when the detectives received a telephone call from Freda Pflaum, a public defender who was notified of Coleman’s arrest by the Florida Department of Health and Rehabilitative Services. The detectives told Coleman that the public defender asked them to “cease any further interview at this time”; they then turned off the tape recorder.
The detectives put public defender Pflaum in contact with Assistant State Attorney Douglas Spangler. When Pflaum said that she intended to instruct Coleman not to answer any more questions, Spangler told her that she could not talk to Coleman on the telephone, but that she could sé'e him if she drove to the station. Pflaum declined to do so. Coleman was not informed that Pflaum had said she intended to instruct him not to answer any more questions.
Rigney and Valente then turned the tape recorder back on and resumed their interrogation. Shortly afterwards, the following exchange took place:
Valente: “And what you’re saying, or what you’re about to say you’re going to do of your own free will; is that correct?”
Coleman: “Yes. Unless, what about that one guy, though?”
Valente: “What guy?”
Coleman: “The guy — ”
Rigney: “Public defender.”
Coleman: <cYeah.”
Valente: “Okay.”
Rigney: “I explained to him what the public defender was — ”
Valente: “Okay. Tony, do you feel that you want to have a public defender?”
[1423]*1423Coleman: “I don’t know. But if he said to stop it I don’t want to do what he said not to do.”
Valente: “Ail right. Well, do you have any objections to talking to us? It’s up to you. Now, again, you know what our job is. We need to know what happened, and that’s basically it. But we don’t want to do anything, we don’t want to force you to do anything that you don’t want to do.
If -you want to talk to [us], fine, we’ll continue with the conversation. You can stop any time you want to stop. You can ask us any questions, but it’s up to you. If you want to talk to us we’ll listen. If you want us to stop asking you any questions, we’ll do that.”
Coleman: “I guess if that guy thinks it’s all right, I don’t care.”
The detectives asked Coleman no more questions about the killing for the next several minutes. Instead, they asked him whether he wanted to continue the interrogation. At no point did Coleman say either that he wanted to stop talking or to speak to an attorney. Finally, when Valente asked, “Do you want to talk to us alone, or do you want to have somebody with you?”, Coleman said, “I want to talk.” Valente asked Coleman if he was sure; Coleman said that he was. The detectives resumed asking questions about the killing. Coleman then admitted that he knew the difference between right and wrong, and that what he had done to his sister was “terribly wrong.”
At trial, Coleman raised the insanity defense. Three psychiatrists testified that they thought he was sane when he killed his sister; two testified that they thought he was insane at the time of the killing. The taped confession was played for the jury. During closing argument, the prosecutor pointed to Coleman’s admission that his actions were “terribly wrong” and argued that that indicated he was sane. Coleman had made that admission only during his third confession, and only after he had made the comment in question about whether to invoke his Miranda rights.
Coleman’s motion to suppress the confession was denied.
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CARNES, Circuit Judge:
Gerald Anthony Coleman appeals from the district court’s order denying his petition for a writ of habeas corpus pursuant to 28 U.S.C. § 2254. At Coleman’s trial, the evidence against him included statements he made to two detectives shortly after his arrest. On appeal, Coleman raises two issues that merit discussion. First, he contends that the detectives continued to interrogate him after he invoked his Fifth Amendment right to remain silent, and that his subsequent statements were therefore inadmissible. Second, he contends that his waiver of his Miranda rights was ineffective because of his youth and mental illness. For the reasons that follow, we affirm.
[1422]*1422I. BACKGROUND
Coleman was convicted by a Sarasota County jury of the second-degree murder of his ten-year-old sister, a crime committed when he was fifteen years old. He was sentenced to forty years imprisonment. The Second District Court of Appeal affirmed Coleman’s conviction and sentence. Coleman v. State, 515 So.2d 313 (Fla.Dist.Ct.App. 1987). His writ of certiorari to the Supreme Court of Florida was denied. Coleman v. State, 523 So.2d 576 (Fla.1988).
Coleman filed a petition for habeas corpus in the United States District Court for the Middle District of Florida, arguing that his confession was obtained in violation of Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966). The district court denied the petition.
The facts in this case are undisputed. On January 18, 1984, when Coleman returned home from school, he decided to kill his father. He therefore asked his sister to leave the house; she declined to do so and instead went to her bedroom to play with a stuffed animal. Coleman picked up a knife and followed his sister into her bedroom, telling her he was going to kill her. After backing her into a closet with the knife, Coleman strangled her with his hands for a few minutes. She started to breath again after he relaxed his grip, so he strangled her again until his hands grew tired. Then he knotted a belt around her neck. When he was finished, he wrapped her dead body in a blanket and placed it in the closet next to the teddy bear with which she had been playing. He then rode his bicycle to a store where he bought himself candy and a soft drink.
Upon his return, Coleman called a suicide counseling center and reported that he had killed his sister. He then went out again. A police officer found him in the neighborhood, arrested him, and read him the Miranda warnings, after which Coleman told the officer that he had strangled his sister. Coleman was taken to the Sarasota County Sheriffs Office, where he was questioned by Detective Paul Rigney and Detective-Sergeant Dario Valente. Rigney advised Coleman of his Miranda rights again; Coleman responded that he understood his rights and that he was willing to talk; he then confessed for the second time that he had killed his sister.
Rigney and Valente then turned on a tape recorder to record the interrogation. At the beginning of the recorded segment, they informed Coleman of his Miranda rights once more, which was the third time he had heard them that day. Coleman again expressed his willingness to talk, and for the third time confessed that he had strangled his sister. A few minutes later, the interrogation was interrupted when the detectives received a telephone call from Freda Pflaum, a public defender who was notified of Coleman’s arrest by the Florida Department of Health and Rehabilitative Services. The detectives told Coleman that the public defender asked them to “cease any further interview at this time”; they then turned off the tape recorder.
The detectives put public defender Pflaum in contact with Assistant State Attorney Douglas Spangler. When Pflaum said that she intended to instruct Coleman not to answer any more questions, Spangler told her that she could not talk to Coleman on the telephone, but that she could sé'e him if she drove to the station. Pflaum declined to do so. Coleman was not informed that Pflaum had said she intended to instruct him not to answer any more questions.
Rigney and Valente then turned the tape recorder back on and resumed their interrogation. Shortly afterwards, the following exchange took place:
Valente: “And what you’re saying, or what you’re about to say you’re going to do of your own free will; is that correct?”
Coleman: “Yes. Unless, what about that one guy, though?”
Valente: “What guy?”
Coleman: “The guy — ”
Rigney: “Public defender.”
Coleman: <cYeah.”
Valente: “Okay.”
Rigney: “I explained to him what the public defender was — ”
Valente: “Okay. Tony, do you feel that you want to have a public defender?”
[1423]*1423Coleman: “I don’t know. But if he said to stop it I don’t want to do what he said not to do.”
Valente: “Ail right. Well, do you have any objections to talking to us? It’s up to you. Now, again, you know what our job is. We need to know what happened, and that’s basically it. But we don’t want to do anything, we don’t want to force you to do anything that you don’t want to do.
If -you want to talk to [us], fine, we’ll continue with the conversation. You can stop any time you want to stop. You can ask us any questions, but it’s up to you. If you want to talk to us we’ll listen. If you want us to stop asking you any questions, we’ll do that.”
Coleman: “I guess if that guy thinks it’s all right, I don’t care.”
The detectives asked Coleman no more questions about the killing for the next several minutes. Instead, they asked him whether he wanted to continue the interrogation. At no point did Coleman say either that he wanted to stop talking or to speak to an attorney. Finally, when Valente asked, “Do you want to talk to us alone, or do you want to have somebody with you?”, Coleman said, “I want to talk.” Valente asked Coleman if he was sure; Coleman said that he was. The detectives resumed asking questions about the killing. Coleman then admitted that he knew the difference between right and wrong, and that what he had done to his sister was “terribly wrong.”
At trial, Coleman raised the insanity defense. Three psychiatrists testified that they thought he was sane when he killed his sister; two testified that they thought he was insane at the time of the killing. The taped confession was played for the jury. During closing argument, the prosecutor pointed to Coleman’s admission that his actions were “terribly wrong” and argued that that indicated he was sane. Coleman had made that admission only during his third confession, and only after he had made the comment in question about whether to invoke his Miranda rights.
Coleman’s motion to suppress the confession was denied. In his habeas petition, he argued that the failure to suppress was in error because his confession was involuntary, and because the interrogating officers continued to question him, in violation of Miranda, after he indicated that he wished to remain silent. The federal magistrate disagreed, and the district court adopted the magistrate’s recommendation as the opinion of the court. Coleman appeals, raising the same issues.
II. DISCUSSION
We first address Coleman’s contention that the interrogating officers ignored his invocation of his Miranda rights, and consider whether Coleman’s statement was sufficient to invoke his right to remain silent. We then discuss Coleman’s argument that he never voluntarily and intelligently waived his Miranda rights.
A. WHETHER THE POLICE VIOLATED COLEMAN’S RIGHT TO REMAIN SILENT
The Supreme Court, in Miranda v. Arizona, 384 U.S. 436, 473-74, 86 S.Ct. 1602, 1627-28, 16 L.Ed.2d 694 (1966), held that under the Fifth Amendment when a person undergoing a custodial interrogation “indicates in any manner, at any time prior to or during questioning, that he wishes to remain silent, the interrogation must cease.” On appeal, Coleman argues that his response to Valente’s question about whether he wanted to have a public defender constituted an unequivocal invocation of his right to remain silent. His exact words were: “I don’t know. But if he said to stop it I don’t want to do what he said not to do.” Reviewing de novo the district court’s application of the law to the undisputed facts of this case, United States v. Mendoza-Cecelia, 963 F.2d 1467, 1471 (11th Cir.), cert. denied, — U.S. -, 113 S.Ct. 436, 121 L.Ed.2d 356 (1992), we disagree with Coleman’s contention. Coleman’s statement was insufficiently clear to invoke his right to remain silent.
Before the Supreme Court’s recent decision in Davis v. United States, — U.S. -, 114 S.Ct. 2350, 129 L.Ed.2d 362 (1994), the rule in this Circuit was that: “When a defendant makes an equivocal request for an attor[1424]*1424ney during a custodial interrogation, ‘the scope of that interrogation is immediately narrowed to one subject and one only. Further questioning thereafter must be limited to clarifying that request until it is clarified.’ ” Owen v. Alabama, 849 F.2d 536, 539 (11th Cir.1988) (quoting Thompson v. Wainwright, 601 F.2d 768, 771 (5th Cir.1979) (emphasis in original)); accord Mendoza-Cecelia, 963 F.2d at 1472. We applied the same rule to equivocal invocations of the right to cut off questioning: “[Wjhere an individual in custody makes an equivocal invocation of his right to remain silent, further questioning must be restricted to clarifying that request until it in fact is clarified, and no statement taken after the request but before the clarification can clear the Miranda hurdle.” United States v. Pena, 897 F.2d 1075, 1081 (11th Cir.1990) (citing Martin v. Wainwright, 770 F.2d 918, 924 (11th Cir.1985), modified, 781 F.2d 185 (11th Cir.), cert. denied, 479 U.S. 909, 107 S.Ct. 307, 93 L.Ed.2d 281 (1986)); accord United States v. Ramsey, 992 F.2d 301, 305 (11th Cir.1993).
However, our prior decisions must yield to supervening decisions of the Supreme Court. E.g., Myrick v. Freuhauf Corp., 13 F.3d 1516, 1521 (11th Cir.1994) (“It is the law- of this Circuit that we are bound by a prior panel’s decision except to the extent it is altered by a supervening Supreme Court decision, which we will, of course, follow instead.”) Davis is a supervening decision which changes our “clarification only” rule. In Davis, the Supreme Court held that, “[although a suspect need not speak with the discrimination of an Oxford don, he must articulate his desire to have counsel present sufficiently clearly that a reasonable police officer in the circumstances would understand the statement to be a request for an attorney.” — U.S. at -, 114 S.Ct. at 2355 (internal quote marks and citation omitted). “If the suspect’s statement is not an unambiguous or unequivocal request for counsel, the officers have no obligation to stop questioning him.” Id. at-, 114 S.Ct. at 2356. Although recognizing that “it will often be good police practice for the interviewing officers to clarify whether or not he actually wants an attorney,” the Court pointedly declined to adopt a rule requiring that officers ask clarifying questions. Id. “Unless the suspect actually requests an attorney, questioning may continue.” Id.
Because we are bound to follow the Supreme Court’s holding in Davis, our decisions creating a duty to clarify a suspect’s intent upon an equivocal invocation of counsel are no longer good law. Furthermore, we have already recognized that the same rule should apply to a suspect’s ambiguous or equivocal references to the right to cut off questioning as to the right to counsel. Martin v. Wainwright, 770 F.2d 918, 924 (11th Cir.1985) (“We see no reason to apply a different rule to equivocal invocations of the right to cut off questioning.”), modified on other grounds, 781 F.2d 185 (11th Cir.), cert. denied, 479 U.S. 909, 107 S.Ct. 307, 93 L.Ed.2d 281 (1986). The Supreme Court’s concern in Davis was to craft “a bright line that can be applied by officers in the real world of investigation and interrogation without unduly hampering the gathering of information.” — U.S. at -, 114 S.Ct. at 2352. The Court rejected a rule requiring that police cease questioning a suspect after an ambiguous or equivocal invocation of his Miranda rights out of a fear that the “clarity and ease of application” of the bright line rule “would be lost.” Id. Because this concern applies with equal force to the invocation of the right to remain silent, and because we have previously held that the same rule should apply in both contexts, we hold that the Davis rule applies to invocations of the right to remain silent. A suspect must articulate his desire to cut off questioning with sufficient clarity that a reasonable police officer in the circumstances would understand the statement to be an assertion of the right to remain silent. If the statement is ambiguous or equivocal, then the police have no duty to clarify the suspect’s intent, and they may proceed with the interrogation.
We conclude, as did the magistrate judge and the district court judge, that Coleman’s statement — “I don’t know. But if he said to stop it I don’t want to do what he said not to do.” — is equivocal. Our conclusion is consistent with the closest precedent of this Court that we have found. During interrogation in United States v. Mendoza-Cecelia, 963 F.2d [1425]*14251467, 1472 (11th Cir.1992), the suspect said: “I don’t know if I need a lawyer, maybe I should have one, but I don’t know if it would do me any good at this point.” This Court held that that statement was equivocal. Id.
In concluding that Coleman’s statement was equivocal, we disagree with the dissent about whether Coleman, when he made the statement in question, knew that the public defender had said he should not talk any more. The record does not indicate that Coleman knew anything more than that the public defender had called earlier, spoken to one of the detectives, and in the words of that detective, requested that the detectives “cease any further interview at this time. ” (Emphasis added.) It was only after a sixteen-minute break, during which there was communication between the public defender and the assistant state attorney, that the detectives resumed questioning Coleman.
Coleman himself apparently did not interpret anything the detectives had told him about the public defender’s call to be advice that Coleman should stop talking to the detectives. The next statement Coleman made after the statement in question, referring to the public defender, was: “I guess if that guy thinks it’s all right, I don’t care.”1 If Coleman had known that the public defender did not want him to talk anymore, the very next words out of Coleman’s mouth would not have reflected a belief that the public defender thought it was all right for him to continue talking.
Our reading of the record concerning the extent of Coleman’s knowledge comports with the interpretation of that record by Coleman’s own attorney. During oral argument, Coleman’s attorney conceded:
From my review of the record, there is not any instance in which the police officers tell the petitioner that his public defender called and that his public defender told them that he did not want—that is, the petitioner should not speak with them. They simply told him that the public defender had called, and that he had a right to the public defender.
We accept that concession.2
By failing to focus on all of the facts, the dissent misinterprets our holding. See dissenting opinion at 1429, n. 3. We do not hold that the statement, “I don’t want to do what [the public defender] said not to do” would be equivocal if the suspect knew that the public defender wanted him to stop talking. That is not this case. In this case, the suspect, Coleman, said: “I don’t know. But if he said to stop it I don’t want to do what he said not to do.” (Emphasis added.) Coleman also indicated (“I guess if that guy thinks it’s all right ... ”) that Coleman did not know the public defender wanted him to stop talking, and his attorney has conceded to this Court that the record does not show that he knew. Our holding is limited to the specific facts of this case, under which a reasonable officer could interpret the suspect’s words to mean that, as he said, he did not know whether he wanted to stop talking.
We do not need a dictionary to define the phrase: “I don’t know.” However, since the use of such reference works is in vogue among courts these days, we will point out the dictionary definition of “equivocal.” It is defined as: “Having different significations equally appropriate or plausible; capable of double interpretation; ambiguous,” 6 Oxford English Dictionary 369 (2d ed., J.A. Simpson & E.S.C. Weiner, eds., 1989); and as: “Having two or more significations; capable of more than one interpretation; of doubtful meaning; ambiguous,” Webster’s Third International Unabridged Dictionary 769 (1986). Coleman’s statement is capable of [1426]*1426equally plausible, differing interpretations; it is ambiguous; hence, it is equivocal.
Because Coleman’s statement was equivocal, his subsequent statements were admissible. It does not matter whether the detectives dropped all questions about the crime until Coleman clarified his intent, because in the wake of the Supreme Court’s decision in Davis, there is no duty to clarify a suspect’s intent after such a statement. The obligation to cease questioning a suspect arises only when the suspect unambiguously invokes the right to remain silent. That did not occur here.
B. WHETHER COLEMAN EFFECTIVELY WAIVED HIS MIRANDA RIGHTS
Coleman also contends that, because of the conduct of the police, as well as his youth and mental difficulties, his waiver of his Miranda rights was not voluntary and intelligent, and was therefore not effective. Under Miranda, the admission of statements taken during a custodial interrogation conducted outside the presence of the suspect’s attorney is conditioned on the government’s ability to show “that the defendant knowingly and intelligently waived his privilege against self-incrimination and his right to retained or appointed counsel.” 384 U.S. at 475, 86 S.Ct. at 1628.
The inquiry has two distinct dimensions. First, the relinquishment of the right must have been voluntary in the sense that it was the product of a free and deliberate choice rather than intimidation, coercion, or deception. Second, the waiver must have been made with a full awareness of both the nature of the right being abandoned and the consequences of the decision to abandon it. Only if the “totality of the circumstances surrounding the interrogation” reveals both an uncoerced choice and the requisite level of comprehension may a court properly conclude that the Miranda rights have been waived.
Moran v. Burbine, 475 U.S. 412, 421, 106 S.Ct. 1135, 1141, 89 L.Ed.2d 410 (1986) (quoting Fare v. Michael C., 442 U.S. 707, 725, 99 S.Ct. 2560, 2572, 61 L.Ed.2d 197 (1979)) (citations omitted). Mental illness is one factor to be considered in determining whether a waiver was made knowingly, Miller v. Dugger, 838 F.2d 1530, 1539 (11th Cir.), cert. denied, 486 U.S. 1061, 108 S.Ct. 2832, 100 L.Ed.2d 933 (1988); a juvenile’s age, experience, education, background, and intelligence are others, Fare, 442 U.S. at 725, 99 S.Ct. at 2572. We review de novo the district court’s determination of the voluntariness of a defendant’s confession. Cannady v. Dugger, 931 F.2d 752, 753-54 (11th Cir.1991).
The Supreme Court has held that “coercive police activity is a necessary predicate to the finding that a confession is not ‘voluntary’ within the meaning of the Due Process Clause.” Colorado v. Connelly, 479 U.S. 157, 167, 107 S.Ct. 515, 522, 93 L.Ed.2d 473 (1986). There is no indication in the record that Coleman was coerced. The transcript of Coleman’s interrogation shows the opposite: at no time was he threatened or intimidated, and his interrogators made it clear to him that he could end their discussion at any time. Coleman’s confession was voluntary.
The next step in the analysis is to determine whether the confession was made knowingly and intelligently. The evidence establishes that Coleman was able to comprehend the Miranda warnings and the consequences of waiving those warnings. At the evidentiary hearing held on Coleman’s motion to suppress his confession, the psychiatrist whom Coleman called to testify to his state of mind, Dr. Emanuel Tanay, testified that Coleman was “of superior intelligence” and would have understood the Miranda warnings. A psychiatrist called by the State also testified that Coleman had the mental capacity to understand the Miranda warnings. A clinical psychologist called by the State testified that he had determined that, intellectually, Coleman “functions within the superior range of ability”; he also testified that Coleman had the capacity to understand the Miranda warnings and to make a knowing and understanding waiver of those rights. There was no evidence to the contrary. The district court was therefore entirely justified [1427]*1427in determining that Coleman knowingly and intelligently waived his rights.3
III. CONCLUSION
The order of the district court denying Coleman’s habeas petition is AFFIRMED.