(NEW YORK) — Daniel Penny is expected to turn himself in as soon as Friday to face criminal charges in connection with the chokehold death of Jordan Neely aboard an F train, according to the Manhattan district attorney’s office.

“We can confirm that Daniel Penny will be arrested on a charge of Manslaughter in the Second Degree,” a spokesperson for Manhattan District Attorney Alvin Bragg said. “We cannot provide any additional information until he has been arraigned in Manhattan Criminal Court, which we expect to take place tomorrow.”

Neely died following a chokehold on May 1. Video showed Penny, a Marine veteran, putting Neely in a chokehold following outbursts from Neely on the train.

Neely was homeless at the time of his death. Some witnesses reportedly told police that Neely was yelling and harassing passengers on the train, authorities said.

Police sources told ABC News that Penny was not specifically being threatened by Neely when he intervened and that Neely had not become violent and had not been threatening anyone in particular.

Attorneys for Penny offered “condolences to those close to Mr. Neely” and claimed “Mr. Neely began aggressively threatening Daniel,” and that the Marine veteran and others “acted to protect themselves.”

“Mr. Neely had a documented history of violent and erratic behavior, the apparent result of ongoing and untreated mental illness,” said the statement from the law firm of Raiser and Kenniff. “When Mr. Neely began aggressively threatening Daniel Penny and the other passengers, Daniel, with the help of others, acted to protect themselves, until help arrived. Daniel never intended to harm Mr. Neely and could not have foreseen his untimely death.”

In footage of the incident, Penny can be seen holding Neely in a chokehold for nearly 3 minutes, as another man held down Neely’s body.

The Neely family attorneys criticized Penny’s response.

“The truth is, he knew nothing about Jordan’s history when he intentionally wrapped his arms around Jordan’s neck, and squeezed and kept squeezing,” the Neely family attorneys said in a statement.

“Daniel Penny’s press release is not an apology nor an expression of regret. It is a character assassination, and a clear example of why he believed he was entitled to take Jordan’s life,” the statement from attorneys Donte Mills and Lennon Edwards continued.

Neely’s death following the chokehold has been ruled a homicide by the city’s medical examiner’s office.

Penny, 24, was questioned by detectives and released, according to police. He told police he was not trying to kill Neely.

According to police sources, Neely had a documented mental health history. Neely had been previously arrested for several incidents on the subway, though it’s unclear how many, if any, led to convictions.

The maximum penalty for second-degree manslaughter is 15 years.

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