WOODBURY - A woman is on a mission to find the person who saved her husband's life in a moment of crisis.

Chris Marshall, 60, went into cardiac arrest while commuting home on the 5:53 p.m. Long Island Rail Road Ronkonkoma-bound train Thursday night. His wife Margaret says she was told that someone close by, who is only referred to in police reports as "the witness," began performing CPR until first responders arrived.

Marshall was rushed to St. Joseph's Hospital in Bethpage, where he is still recovering. Marshall's wife says doctors told her that the person who performed CPR on the train that day must have really known what he was doing because her husband's heart showed no noticeable damage.

Margaret Marshall says she went to the Long Island Rail Road and even took to social media in hopes of tracking down the good Samaritan who prevented her from becoming a widow.

The Marshalls are asking anyone with information to email them.