Ireland, C.J.
We granted the Commonwealth’s application for direct appellate review to determine whether the crime of leaving the scene of an accident where death resulted requires the Commonwealth to prove that the defendant knew he collided with a person. G. L. c. 90, § 24 (2) (a V2) (2). Because the Superior Court judge initially agreed with the Commonwealth that it had no such burden, he found the defendant guilty. However, the judge allowed the defendant’s motion for relief from judgment on the ground that the Commonwealth did have such a burden of proof and ordered a judgment of acquittal to be entered. The Commonwealth appealed. Because we conclude that the Commonwealth must prove the defendant knew he [621]*621“collide[d] with or otherwise cause[d] injury to” a person, we affirm.
Relevant statute. General Laws c. 90, § 24 (2) (a V2) (2) states, in relevant part:
“Whoever operates a motor vehicle upon any [public way or place]. . . and without stopping and making known his name, residence, and the registration number of his motor vehicle, goes away to avoid prosecution or evade apprehension after knowingly colliding with or otherwise causing injury to any person shall, if the injuries result in the death of a person, be punished . . . .”
Facts and procedure. On the night of December 23, 2009, the defendant was driving on Robertson Street in Quincy. Snowbanks one to two feet high lined the street. The defendant struck the victim with the passenger side of his Toyota truck. The next morning, a motorist discovered the victim’s body on the sidewalk between snowbanks and alerted the police.1 The victim had died of blunt force trauma to the chest. Toxicology reports determined that the victim’s blood alcohol level was .25 per cent.
Later that morning, police officials determined that a Toyota truck had struck the victim. They held a press conference asking the public for assistance in finding the vehicle. The defendant heard the announcement on the radio and, through an attorney, contacted the police in the early afternoon.
That day, the defendant gave permission to police to impound his truck for inspection. On December 26, he went to the police station for an interview. His account of events, which the judge found credible and consistent with the evidence, was as follows.
On the night of December 23, the defendant had attended a party at his son’s house on Sea Street in Quincy. Between approximately 8 p.m. and 10:30 p.m., he consumed two glasses of wine, as well as some food. At approximately 11 p.m., the defendant was on his way home, driving along Robertson Street. He saw no one on the street. He had a drink of coffee from a cup he had in the truck’s cup holder and, when he went to put it [622]*622back, “it spilled and [he] . . . reached for it and . . . felt an impact.” He stopped his track in the middle of the road, approximately one hundred feet from the impact, got out of the truck, and walked back approximately ten to twenty feet, but did not see anything in the snowbank. Because there was traffic, he got back in his track and drove away but, while doing so, looked in his rear view mirror to determine whether he could see anything.
As he drove along to another street, he realized that his track did not have its side view mirror and thought that he might have hit a fire hydrant, a street sign, or a bus sign because it was “something pretty solid.” He continued to his home and decided that he would contact his insurance company the next day. Before he did so the next morning, he took his other vehicle to finish some Christmas shopping, after which he heard the police press conference.
The defendant was indicted on motor vehicle homicide, negligent operation of a motor vehicle, and leaving the scene of an accident where death resulted. During a bench trial, the defendant moved for required findings of not guilty at the close of the Commonwealth’s evidence and renewed the motion at the close of all evidence. The motions were denied. However, the judge found the defendant not guilty of the first two indictments. Concerning the remaining indictment, the salient issue was whether the statute required the Commonwealth to prove beyond a reasonable doubt that the defendant knew he collided with a person, as opposed to knowing that he collided with an object. The judge initially agreed with the Commonwealth that the statute required that the Commonwealth prove only that the defendant knew he collided with an object. When he found the defendant guilty, the judge stated:
“For the record, should this case be subject to appellate review, my verdict would have been not guilty on this indictment ... if the Commonwealth had the burden to prove beyond a reasonable doubt that the defendant knew that he had collided with another person.”
After the trial, but before sentencing, the defendant filed another motion to set aside the conviction and enter a “judg[623]*623ment of acquittal,” pursuant to Mass. R. Crim. P. 25 (a), 378 Mass. 896 (1979). At the sentencing hearing, the judge stated that he had reconsidered the law and concluded that he had made an error in interpreting the statute. The judge stated that the statute did require that a defendant must have knowledge that he collided with a person, and that he should have found that the Commonwealth did not meet its burden of proving that the defendant was seeking to avoid responsibility when he left the scene of the accident. The judge concluded that he could not consider a motion under rule 25 (a) because the trial had concluded. However, he invited the defendant to file a motion pursuant to Mass. R. Crim. P. 30 (b), as appearing in 435 Mass. 1501 (2001). Because of the posture of the case the judge also concluded that he was required to sentence the defendant but allowed his motion for a stay of execution.
The defendant then moved pursuant to rule 30.2 In his memorandum of decision and order on the motion, the judge stated that the defendant was not guilty of leaving the scene of an accident where death resulted because, as a matter of fact, the Commonwealth did not prove he knew he collided with a person. The judge also stated that he had erred in finding the defendant guilty and resolved the error of law by entering a judgment of acquittal, stating that a new trial would have raised double jeopardy concerns.
Discussion. General Laws c. 90, § 24 (2) (a lh) (2), criminalizes leaving the scene of an accident. At issue here is the statute’s clause “after knowingly colliding with or otherwise causing injury to any person.” We look first to the statute’s language, which we read according to its plain and ordinary meaning when the text is clear and unambiguous. Foss v. Commonwealth, 437 Mass. 584, 586 (2002). In statutory interpretation, “[njone of the words of a statute is to be regarded as superfluous.” Commonwealth v. Woods Hole, Martha’s Vineyard & Nantucket S.S. Auth., 352 Mass. 617, 618 (1967), quoting [624]*624Bolster v. Commissioner of Corps. & Taxation, 319 Mass. 81, 84-85 (1946).
The Commonwealth argues that a defendant who leaves the scene of an collision that results in death, without leaving pertinent information, violates the law regardless of whether the defendant knows that he collided with a person.
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Ireland, C.J.
We granted the Commonwealth’s application for direct appellate review to determine whether the crime of leaving the scene of an accident where death resulted requires the Commonwealth to prove that the defendant knew he collided with a person. G. L. c. 90, § 24 (2) (a V2) (2). Because the Superior Court judge initially agreed with the Commonwealth that it had no such burden, he found the defendant guilty. However, the judge allowed the defendant’s motion for relief from judgment on the ground that the Commonwealth did have such a burden of proof and ordered a judgment of acquittal to be entered. The Commonwealth appealed. Because we conclude that the Commonwealth must prove the defendant knew he [621]*621“collide[d] with or otherwise cause[d] injury to” a person, we affirm.
Relevant statute. General Laws c. 90, § 24 (2) (a V2) (2) states, in relevant part:
“Whoever operates a motor vehicle upon any [public way or place]. . . and without stopping and making known his name, residence, and the registration number of his motor vehicle, goes away to avoid prosecution or evade apprehension after knowingly colliding with or otherwise causing injury to any person shall, if the injuries result in the death of a person, be punished . . . .”
Facts and procedure. On the night of December 23, 2009, the defendant was driving on Robertson Street in Quincy. Snowbanks one to two feet high lined the street. The defendant struck the victim with the passenger side of his Toyota truck. The next morning, a motorist discovered the victim’s body on the sidewalk between snowbanks and alerted the police.1 The victim had died of blunt force trauma to the chest. Toxicology reports determined that the victim’s blood alcohol level was .25 per cent.
Later that morning, police officials determined that a Toyota truck had struck the victim. They held a press conference asking the public for assistance in finding the vehicle. The defendant heard the announcement on the radio and, through an attorney, contacted the police in the early afternoon.
That day, the defendant gave permission to police to impound his truck for inspection. On December 26, he went to the police station for an interview. His account of events, which the judge found credible and consistent with the evidence, was as follows.
On the night of December 23, the defendant had attended a party at his son’s house on Sea Street in Quincy. Between approximately 8 p.m. and 10:30 p.m., he consumed two glasses of wine, as well as some food. At approximately 11 p.m., the defendant was on his way home, driving along Robertson Street. He saw no one on the street. He had a drink of coffee from a cup he had in the truck’s cup holder and, when he went to put it [622]*622back, “it spilled and [he] . . . reached for it and . . . felt an impact.” He stopped his track in the middle of the road, approximately one hundred feet from the impact, got out of the truck, and walked back approximately ten to twenty feet, but did not see anything in the snowbank. Because there was traffic, he got back in his track and drove away but, while doing so, looked in his rear view mirror to determine whether he could see anything.
As he drove along to another street, he realized that his track did not have its side view mirror and thought that he might have hit a fire hydrant, a street sign, or a bus sign because it was “something pretty solid.” He continued to his home and decided that he would contact his insurance company the next day. Before he did so the next morning, he took his other vehicle to finish some Christmas shopping, after which he heard the police press conference.
The defendant was indicted on motor vehicle homicide, negligent operation of a motor vehicle, and leaving the scene of an accident where death resulted. During a bench trial, the defendant moved for required findings of not guilty at the close of the Commonwealth’s evidence and renewed the motion at the close of all evidence. The motions were denied. However, the judge found the defendant not guilty of the first two indictments. Concerning the remaining indictment, the salient issue was whether the statute required the Commonwealth to prove beyond a reasonable doubt that the defendant knew he collided with a person, as opposed to knowing that he collided with an object. The judge initially agreed with the Commonwealth that the statute required that the Commonwealth prove only that the defendant knew he collided with an object. When he found the defendant guilty, the judge stated:
“For the record, should this case be subject to appellate review, my verdict would have been not guilty on this indictment ... if the Commonwealth had the burden to prove beyond a reasonable doubt that the defendant knew that he had collided with another person.”
After the trial, but before sentencing, the defendant filed another motion to set aside the conviction and enter a “judg[623]*623ment of acquittal,” pursuant to Mass. R. Crim. P. 25 (a), 378 Mass. 896 (1979). At the sentencing hearing, the judge stated that he had reconsidered the law and concluded that he had made an error in interpreting the statute. The judge stated that the statute did require that a defendant must have knowledge that he collided with a person, and that he should have found that the Commonwealth did not meet its burden of proving that the defendant was seeking to avoid responsibility when he left the scene of the accident. The judge concluded that he could not consider a motion under rule 25 (a) because the trial had concluded. However, he invited the defendant to file a motion pursuant to Mass. R. Crim. P. 30 (b), as appearing in 435 Mass. 1501 (2001). Because of the posture of the case the judge also concluded that he was required to sentence the defendant but allowed his motion for a stay of execution.
The defendant then moved pursuant to rule 30.2 In his memorandum of decision and order on the motion, the judge stated that the defendant was not guilty of leaving the scene of an accident where death resulted because, as a matter of fact, the Commonwealth did not prove he knew he collided with a person. The judge also stated that he had erred in finding the defendant guilty and resolved the error of law by entering a judgment of acquittal, stating that a new trial would have raised double jeopardy concerns.
Discussion. General Laws c. 90, § 24 (2) (a lh) (2), criminalizes leaving the scene of an accident. At issue here is the statute’s clause “after knowingly colliding with or otherwise causing injury to any person.” We look first to the statute’s language, which we read according to its plain and ordinary meaning when the text is clear and unambiguous. Foss v. Commonwealth, 437 Mass. 584, 586 (2002). In statutory interpretation, “[njone of the words of a statute is to be regarded as superfluous.” Commonwealth v. Woods Hole, Martha’s Vineyard & Nantucket S.S. Auth., 352 Mass. 617, 618 (1967), quoting [624]*624Bolster v. Commissioner of Corps. & Taxation, 319 Mass. 81, 84-85 (1946).
The Commonwealth argues that a defendant who leaves the scene of an collision that results in death, without leaving pertinent information, violates the law regardless of whether the defendant knows that he collided with a person. To support this argument, the Commonwealth asserts that the statute consists of two parts, “colliding” and “causing injury,” where the adverb “knowingly” modifies only the verb “colliding.”
The ordinary language of the sentence guides our interpretation. See Ten Local Citizen Group v. New England Wind, LLC, 457 Mass. 222, 229 (2010) (preposition undefined in statute interpreted according to its plain meaning); Rowley v. Massachusetts Elec. Co., 438 Mass. 798, 802 (2003) (statute’s phrase interpreted using standard rules of statutory construction and grammar). In its ordinary usage, the adverb “knowingly” modifies both verbs within the clause. See Flores-Figueroa v. United States, 556 U.S. 646, 647 (2009) (adverb “knowingly” applies to all subsequently listed elements of crime in 18 U.S.C. § 1028A[a][1]). The verbs “colliding” and “causing injury” are followed respectively by the prepositions “with” and “to,” signaling that an object follows, here, “any person.” Accordingly, when the clause is read as a whole, it states that a defendant must have left the scene after knowingly colliding with a person “or otherwise” after knowingly causing injury to a person, if the injuries result in death in order to fall under the purview of the statute. The flaw in the Commonwealth’s interpretation is that it disregards the preposition “with,” rendering this word superfluous. See Commonwealth v. Woods Hole, Martha’s Vineyard & Nantucket S.S. Auth., supra. We conclude that, based on the ordinary use of the statute’s language, the adverb “knowingly” in G. L. c. 90, § 24 (2) (a lH) (2), modifies both “colliding” and “causing injury.” Cf. Commonwealth v. Velasquez, 76 Mass. App. Ct. 697, 700 (2010) (adverb “knowingly” applies to both “colliding with” and “causing injury to” property).
The Commonwealth relies on Commonwealth v. McMenimon, 295 Mass. 467 (1936), and Commonwealth v. Horsfall, 213 Mass. 232 (1913), to support its argument that “knowingly” [625]*625modifies only the verb “colliding.” The Commonwealth argues these cases show that the statute’s purpose is to punish those who knowingly leave the scene where a person has been injured, resulting in death, regardless of whether the defendant knew he collided with a person.
These cases are not apt. They interpret earlier versions of the statute where the crimes of injury to a person or property were included in one statute. See Commonwealth v. McMenimon, supra at 468-469 (G. L. c. 90, § 24, as amended by St. 1932, c. 26, § 1, criminalized leaving scene after knowingly colliding with or otherwise causing injury to property or another person; court concluded “knowingly” modified “colliding” and “causing injury”); Commonwealth v. Horsfall, supra at 234 (St. 1909, c. 534, § 22, criminalized reckless operation of motor vehicle and leaving scene after causing injury to person or property). Moreover, they can be distinguished on their facts. Neither case involved the issue whether a defendant knew that he collided with a person. See Commonwealth v. McMenimon, supra at 470 (defendant knew he collided with vehicle in which two women were riding); Commonwealth v. Horsfall, supra at 236 (defendant knew he collided with person, waited “considerable time” before leaving scene, and asked his agent to give his identification).3
The Commonwealth next argues, in essence, that the statute’s legislative history gives credence to its interpretation. “When the words are clear and, when assigned their ordinary meaning, yield a workable and logical result, we interpret the statute without resort to extrinsic aids, such as legislative history.” Foss v. Commonwealth, supra. Although we need not address the statute’s legislative history here, our interpretation is supported by the structure of the statute.4 We also note that, even if we were to conclude that this criminal statute is ambiguous, we [626]*626must “give the defendant the benefit of the ambiguity.” Commonwealth v. Williamson, 462 Mass. 676, 679 (2012), quoting Commonwealth v. Roucoulet, 413 Mass. 647, 652 (1992).5
Here, the uncontested facts are that the defendant knew he had a collision. The judge, as the trier of fact, determined the Commonwealth did not prove beyond a reasonable doubt that the defendant knew he had collided with a person. Therefore, the defendant did not knowingly collide with a person or otherwise injure a person, resulting in death, within the meaning of G. L. c. 90, § 24 (2) (a V2) (2).
Conclusion. Based on the plain language of the statute, we conclude that leaving the scene of an accident causing injury to a person, resulting in that person’s death, requires the Commonwealth to prove that the defendant knew he collided with a person “or otherwise” caused injury to a person.
Judgment affirmed.