Daniel Penny's martial arts instructor from the Marine Corps took the stand Thursday for day six of witness testimony in Penny's trial in the chokehold death of Jordan Neely.

A former military combat instructor says a fellow Marine veteran misused a combat maneuver when he fatally choked a homeless man aboard a Manhattan subway last year.

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.Penny has pleaded not guilty to second-degree manslaughter and criminally negligent homicide in Neely's chokehold death.

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.

In the eighteen months since the killing, Penny has been embraced by conservatives as a good Samaritan who used his military training to protect his fellow riders. U.S. Rep. U.S. Matt Gaetz, who

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.