UPDATE | Man accused of Facebook video killing said he 'just snapped'

CLEVELAND (AP) — In a rambling video, Steve Stephens said, "I snapped, I just snapped." But as the manhunt dragged on today for the man accused of posting Facebook footage of himself killing a retiree, police were unable to explain what set him off.

"Only Steve knows that," Cleveland police Chief Calvin Williams said as authorities posted a $50,000 reward for Stephens' capture in the shooting of Robert Godwin Sr., a 74-year-old former foundry worker.

In the video, Stephens blamed a former girlfriend he had lived with, saying he woke up last week and "couldn't take it anymore." But in a statement today, the woman shed little light on what might have gone wrong and said Stephens was good to her and her children.

As for the shooting victim, Godwin appeared to have been selected at random, gunned down while picking up aluminum cans Sunday afternoon after spending Easter with some of his children.

A manhunt that started in Cleveland's gritty east side expanded rapidly into a nationwide search for Stephens, a 37-year-old job counselor who worked with teens and young adults, police said.

"He could be nearby. He could be far away or anywhere in between," FBI agent Stephen Anthony said.