WOODBURY - A woman’s mission to find the person who saved her husband's life in a moment of crisis ended in success Sunday.

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 was only referred to in police reports as "the witness," began performing CPR until first responders arrived.

The “witness” has been identified as Bill Gerow, of Farmingdale. He says he learned CPR when he was 13 years old in the Boy Scouts. Gerow says his instincts immediately kicked in during the incident.

“I literally had his head in my hand…I laid him down and I immediately started compressions," he told News 12.

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 met Gerow Sunday, gave him a hug and called him a hero.

“You saved my family," she told Gerow.