The suspect, Steve Stephens, remains at large and police fear he managed to escape OH and could have crossed into another state.
They stood at the very spot where just the day before Steve Stephens took pictures of himself shooting Godwin who just happened to be walking down the street, then posted the video on Facebook. Police said he might be driving a white or cream-coloured Ford Fusion, and asked anyone who spots him or his vehicle to call police or a special Federal Bureau of Investigation hotline (800-CALLFBI).
Sternbeck said police are encouraging people to be vigilant, "and if they've believe they've spotted this individual, to provide this information to police and we will investigate".
It was the last time the son would ever see his father, who shortly afterward was shot and killed at random by a deranged man who broadcast the killing on Facebook.
"This is a horrific crime and we do not allow this kind of content on Facebook", a spokeswoman for the company said in a statement Monday.
Stephens, who has no prior criminal record, is not suspected in any other murders, police said.
Authorities searching multiple states for a suspect in the deadly shooting of a Cleveland man say they have no idea what led up to what they say appears to be a random shooting.
They came to the 600 block of E. 93rd to remember 74-year-old Robert Godwin Senior. Authorities in Cleveland have expanded their manhunt nationwide for Stephens, a man suspected of gunning down a retiree and posting a video of the crime on Facebook.
"As a result of this bad series of events, we are reviewing our reporting flows to be sure people can report videos and other material that violates our standards as easily and quickly as possible", Justin Osofsky, a Facebook vice president, said in a blog post.
Stephens posted three videos, Facebook said.
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"She's the reason why this is about to happen to you", Stephens said. "We know he's out there someplace", he said.
But Williams said police had searched dozens of locations overnight "to no avail".
In the video, Stephens blamed a former girlfriend he had lived with, saying he woke up last week and "couldn't take it anymore".
The company said it disabled Stephen's account within 23 minutes of receiving the first report about the video of the fatal shooting and two hours after receiving any report.
Stephens, a case manager with Beech Brook, a children's behavioral health agency, had recently been working with young adults, a Beech Brook official told BuzzFeed News.
His mobile phone signal was last tracked on Sunday afternoon to Erie, Pennsylvania, 100 miles (160km) from where police say he shot Mr Godwin.
One of Robert Godwin's sons said he was greatly disturbed by how the killer carried out his terrible deed.
"I just snapped, man", he says in the live video.
Cleveland police chief Calvin Williams confirmed one killing but said they did not know of any other victims.
In one of the videos, Stephens can be seen holding up his Beech Brook employee identification badge.
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