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 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.

The medical examiner is taking the stand in Daniel Penny's manslaughter trial as the prosecution's final witness. CBS News New York's Doug Williams reports.