A first responder testified Monday in Karen Read’s murder retrial that she heard the defendant say, “I hit him,” multiple times after her boyfriend, Boston police officer John O’Keefe, was found unresponsive in the snow outside a Massachusetts home in 2022.

Prosecutors allege, following a night of drinking in Canton, that Read struck O’Keefe with her Lexus SUV outside of a get-together at another officer’s home and left him to die in a blizzard in January 2022. An autopsy found that the 46-year-old died of hypothermia and blunt force injuries to the head.

After a jury was unable to reach a verdict in the initial murder trial last year, Read is being retried on charges including second-degree murder, vehicular manslaughter while operating a vehicle under the influence of alcohol and leaving the scene of a collision causing death. She has pleaded not guilty and maintains her innocence, with her attorneys arguing the police investigation was “riddled with errors” and alleging that witnesses colluded on their narrative about O’Keefe’s death.

Katie McLaughlin, a Canton firefighter paramedic who responded to the scene after Read and two others found O’Keefe in the snow outside the residence, was one of several witnesses who testified Monday in the ongoing trial.

As she did when she testified during the first trial, McLaughlin told the court that Read told her, “I hit him,” while she was trying to get details on O’Keefe during the early morning of Jan. 29, 2022.

“I asked if there had been any significant trauma that happened that preceded this, and she answered with a series of statements that she repeated — ‘I hit him. I hit him,” McLaughlin testified.

McLaughlin testified that she heard Read say, “I hit him,” four times.

An officer who was also present then signaled for his sergeant to come down, she said.

McLaughlin said she didn’t ask Read to clarify what she meant.

“I felt at that point, given the situation and how disturbing — and it was a very emotional situation, the woman was very upset — I didn’t feel comfortable pushing and asking for more. I just didn’t think that it was the right time for that,” she said. “And it was also really not my place at that point, and I feel like that was something that the police were — that’s more their role.”

McLaughlin said she subsequently told two colleagues in the ambulance at the scene what Read allegedly said.

O’Keefe was found by a flagpole near the home of Boston police officer Brian Albert.

Similar to the first trial when McLaughlin testified, defense attorney Alan Jackson grilled the witness on her relationship with Albert’s daughter, Caitlin, while mentioning times the two have attended the same social functions.

McLaughlin described Caitlin Albert as someone she went to high school with, shares mutual friends and socializes with, but wouldn’t consider a friend.

“We’ve known each other for years, but we are not close friends,” McLaughlin said. “We don’t have a relationship, just her one-on-one. It’s just group settings.”

Jackson also questioned if McLaughlin took any notes on what she said she heard Read say. The paramedic said she didn’t, and had only jotted down demographic information on O’Keefe onto her glove, such as his name and date of birth.

Asked by the prosecutor how she remembered Read’s alleged remarks, she said, “I won’t ever forget those statements.”

Jennifer McCabe, a key witness for the prosecution, testified last week that she also heard Read say, “I hit him,” while standing with Read and McLaughlin.