NEW YORK – The Marine veteran on trial for the subway chokehold death of Jordan Neely called an expert forensic pathologist to the witness stand Thursday, and he came to a dramatically different conclusion than the New York City Medical Examiner's Office.

"The chokehold did not cause the death," Dr. Satish Chundru testified.

Daniel Penny, 26, faces up to 15 years in prison if convicted on the top charge he faces, manslaughter, for the death of 30-year-old Neely.

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dr chundru leaves courtroom

Dr. Chundru leaves during a recess in Daniel Penny's New York City manslaughter trial on Thursday, Nov. 21, 2024. (Rashid Umar Abbasi for Fox News Digital)

He was on his way to the gym after class at a New York college in May 2023, when Neely, a homeless man with schizophrenia and a drug habit, barged onto a subway car and shouted death threats.

Chundru, a former Miami-area medical examiner who now runs a private practice in Texas conducting autopsies in a half-dozen counties, said that he did not believe an air choke caused Neely's unconsciousness and, therefore, did not cause his death.

Chundru said he found the cause of death to be "the combined effects of sickle cell crisis, the schizophrenia, the struggle and restraint, and the synthetic marijuana."

Someone schizophrenic, high on K2 and involved in a struggle can die without a chokehold being involved at all, he said. Similarly, he said, if there were no health issues and the chokehold was the only factor, Neely would not have died.

Daniel Penny arrives at court to face a trial in the Jordan Neely subway chokehold death

Daniel Penny arrives at Manhattan Supreme Court, Tuesday, Nov. 19, 2024. Penny, a Marine veteran, is charged with second-degree manslaughter and criminally negligent homicide in the 2023 death of Jordan Neely on a New York City subway train. (Rashid Umar Abbasi for Fox News Digital)

"In your opinion, did Mr. Penny choke Mr. Neely to death in 2023?" defense lawyer Steven Raiser asked. 

"No," Dr. Chundru replied, before the defense ended its questioning.

In cross-examination, Assistant Manhattan District Attorney Dafna Yoran grilled him on some of his past cases, asking about an incident that he ruled an asphyxiation – and a defense expert disputed his findings, pointing out there was cocaine in the victim's system. It happened in 2012 and he said he didn't remember it well.

Read Jordan Neely's autopsy:

She got Dr. Chundru to concede that video shows Penny's arm in a "blood choke" position and that brushing on Neely's body matched.

However, he said, "You can have a chokehold applied, leave with that kind of injury, and survive."

He compared Neely's death to another one Dr. Chundru worked on and he said the two weren't comparable.

"With the video, it gives us the evidence that a chokehold occurred but did not cause the death [of Neely]," he testified.

The judge dismissed jurors for the day shortly before 5 p.m.

Trial resumes Friday at 10 a.m., and Dr. Chundru is expected to return to the witness stand for more testimony.

Cynthia Harris, M.D. arrives for Daniel Penny’s trial at the Manhattan Criminal Court building

Dr. Cynthia Harris arrives for Daniel Penny’s trial at the Manhattan Criminal Court building in New York City on Friday, Nov. 15, 2024. Penny, a Marine veteran, is charged with second-degree manslaughter and criminally negligent homicide in the 2023 death of Jordan Neely on a New York City subway train. (Adam Gray for Fox News Digital)

With the defense expert on the stand, Dr. Cynthia Harris, who conducted the city's autopsy, looked on from the audience. She testified in the trial three days earlier.

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Harris found it was the chokehold that killed Neely, not the synthetic drugs in his system, his sickle cell genetic disorder or cardiac arrest. 

"This is a very complicated case," Chundru testified. "We have schizophrenia involved, sickle cell trait involved, a chokehold."

Jordan Neely is pictured before going to see the Michael Jackson movie

Jordan Neely is pictured before going to see the Michael Jackson movie, "This is It," outside the Regal Cinemas on 8th Avenue and 42nd Street in Times Square in New York City in 2009. (Andrew Savulich/New York Daily News/Tribune News Service via Getty Images)

Additionally, Neely had K2, a form of synthetic marijuana that experts testified is more like cocaine, in his toxicology report.

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Dr. Chundru said that asphyxiation death comes in two phases. In the first, the individual loses consciousness. In the second, sustained pressure leads to death

"What’s also important is unconsciousness always proceeds death in a chokehold," he said.

Dr. Satish Chundru carries poster boards into court

Dr. Satish Chundru arrives at a Manhattan courthouse Thursday to testify in the trial of Daniel Penny, a Marine veteran accused of manslaughter in the chokehold death of Jordan Neely. (Rashid Umar Abbasi for Fox News Digital)

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However, rendering someone unconscious does not mean they are always going to die, he said. When they are let go, they typically wake up, he said.

"In a sickle cell crisis, death is a lack of oxygen, so the same thing [in] an asphyxia death," he said.