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Jurors have reached a verdict in Karen Read's retrial in the murder of her Boston police officer boyfriend John O'Keefe, who prosecutors allege she killed in a drunken hit-and-run during a blizzard on Jan. 29, 2022.

Jurors found Read not guilty of second-degree murder, the top charge, but guilty of a lesser offense of operating a vehicle under the influence with a blood-alcohol level of .08% or greater.

Special prosecutor Hank Brennan requested 1 year of probation and that Read be entered into a 24D outpatient program – routine penalty for a first drunken driving offense.

 The trial saw more than 30 days of testimony and four days of deliberation. Read was also found not guilty of drunken driving manslaughter and fleeing the scene of a deadly accident. Her first trial on the same charges ended without a verdict last year when jurors deadlocked.

SEE THE PHOTOS: Karen Read not guilty

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Cheers of her supporters, who had been waiting for an update across the street from the courthouse, could be heard inside the courtroom. 

For Read's second trial, the commonwealth appointed a special prosecutor, high-powered defense attorney Hank Brennan, and Read added New York defense attorney Robert Alessi to a team that included Los Angeles' Alan Jackson and Boston's David Yannetti.

SEE THE VIDEO: Verdict revealed

Jack Lu, a retired Massachusetts judge and Boston College law professor, called the outcome "a stunning victory for the defense" that he said would also help Read in a civil lawsuit against her from O'Keefe's family.

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Officer John O’Keefe poses for his official headshot

Officer John O’Keefe poses for his official headshot. O’Keefe’s girlfriend, Karen Reed, is currently on trial for murder after he was found dead outside of a Massachusetts home in January 2022. (Boston Police Department)

The investigation of Read's case led to investigations into the investigators, leading to an audit into the Canton Police Department and the firing of a state police homicide detective.

"Today's outcome may bring a sense of relief to some and continue to raise questions for others," said John McCourt, chairman of Canton's governing body, the select board. "We encourage members of the community to move forward together, treating one another with respect through civil, constructive dialogue."

Fans cheer as Karen Read is found not-guilty

A crowd of supporters react as the verdict is revealed.  (Richard Beetham for Fox News Digital)

Read found O'Keefe around 6 a.m. lying in the snow and unresponsive. She was with two other women – Jennifer McCabe and Kerry Roberts, both of whom testified against her during the trial.

They said Read called them in a panic that morning and said she couldn't find O'Keefe.

Karen Read crying in court hearing the verdict.

Karen Read, flanked by attorneys Elizabeth Little and David Yannetti, reacts to the verdict after her second trial in the death of her former boyfriend, Boston police officer John O'Keefe. (Greg Derr/The Patriot Ledger via AP, Pool)

McCabe testified that on the morning in question, Read repeated three times, "I hit him."

Paramedic Timothy Nuttall, the first witness to take the stand in the trial, said he overheard Read saying the same thing – three times again.

But the defense argued that a collision never happened.

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Victim John O'Keefe's mother looks at Karen Read's lawyer in court during her trial.

Peggy O'Keefe, the mother of deceased Boston police officer John O'Keefe, looks up at defense attorney Alan Jackson, right, during the Karen Read murder trial at Norfolk Superior Court, Tuesday, May 27, 2025, in Dedham, Mass. (Matt Stone/The Boston Herald via AP, Pool)

The couple and other friends and acquaintances, including McCabe, had been out drinking in downtown Canton before they were invited to an after-party at the home of Brian Albert, who testified in the first trial but not the second.

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O'Keefe was found on Albert's lawn hours later.

Witnesses said they saw Read's car outside but neither she nor O'Keefe went into the gathering. She did not testify in her own defense – but she told reporters outside court that she saw O'Keefe go inside before she drove away.

Lawyer Hank Brennan in court during the Karen Read trial.

Prosecutor Hank Brennan during the Karen Read retrial, Tuesday, June 10, 2025, in Dedham, Mass. (Matt Stone/The Boston Herald via AP, Pool)

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Throughout the trial, Brennan played clips of Read's televised interviews, giving jurors a chance to hear not only her version of events, but other commentary she gave journalists, including how she was spiking her own drinks at the bar before O'Keefe's death and an encounter with O'Keefe's mother afterward.

Karen Read in court during her retrial facing murder charges in connection to the death of John O’Keefe.

Karen Read listens to the cross-examination by Robert Alessi of expert accident witness Dr. Judson Welcher while seated at the defense table with her attorneys, Alan Jackson and David Yannetti, during her retrial at Norfolk Superior Court, Wednesday, May 28, 2025, in Dedham, Mass. (Greg Derr/The Patriot Ledger via AP, Pool)

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Prosecutors allege Read hit O'Keefe and drove to his house without him. Read's defense has argued she never hit him, blaming his injuries on a dog attack and an altercation with other men at the party.

Fox News' Lissa Kaplan contributed to this report.