Jordan Neeley’s death was a direct result of the chokehold Daniel Penny held him in, a medical examiner testified Friday, rebutting assertions from the defense team that the former Marine did not apply enough pressure to kill the subway rider and that his death could have had some other cause.

The homicide detective who interviewed Daniel Penny shortly after he placed Jordan Neely in a chokehold on an uptown F train last year knew that Neely had died, he testified at Penny’s criminal trial Thursday. But Penny, he said, did not.

A subway commuter who helped an ex-Marine restrain an agitated man aboard a Manhattan subway last year testified that he tried to convince the veteran to loosen his grip around the man’s neck.

The man seen on video helping Daniel Penny restrain Jordan Neely on board the subway last year took the stand Tuesday on day five of witness testimony in Penny's trial.

Done right, the maneuver should knock a person out without killing them, according to a Marines combat instructor who trained Penny. But held too long, the technique can restrict the flow of blood

When Daniel Penny fatally choked a homeless man aboard a Manhattan subway last year, the veteran appeared to be using a combat technique that he learned in the Marines, according to a martial arts instructor.