The trial of Daniel Penny, the former Marine charged with killing Jordan Neely aboard a New York City subway, featured testimony from a man who helped the defendant restrain the victim.

Eric Gonzalez, who helped Daniel Penny pin Mr. Neely to the floor of a subway car, also said he had lied when he told investigators Mr. Neely had hit him.

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.