Facebook shooting victim Robert Godwin was grandfather to 14 who loved fishing

Facebook is reviewing how it handles violent videos and other objectionable material after a video of a killing in Cleveland remained on its service for more than two hours.

The world's largest social network plans to look for ways to make it easier for people to report videos and to speed up the process of reviewing items once they are reported, Justin Osofsky, Facebook's vice president for global operations and media partnerships, said in a blog post.

"We prioritise reports with serious safety implications for our community, and are working on making that review process go even faster," Osofsky said.

US authorities on Monday widened a manhunt for a murder suspect who, according to police and Facebook, posted a video of himself on the online service shooting an elderly man in Cleveland.

Police said they had received "dozens and dozens" of tips about the possible location of the suspect, Steve Stephens, and tried to convince him to turn himself in when they spoke with him on his mobile phone on Sunday after the shooting.

But Stephens remains at large as the hunt for him expanded nationwide, police said.

The shooting was the latest violent incident shown on Facebook, raising questions about how the company moderates content.

The victim of a fatal shooting that was filmed and posted to Facebook was a retired family man who loved fishing and collected cans.

Robert Godwin was walking down a Cleveland street when he was approached by Stephens. While filming from his phone, Stephens asked Mr Godwin to say his girlfriend's name, which the visibly confused elderly man complies with. 

Stephens then says to Mr Godwin "She's the reason this is about to happen to you. How old are you?" When Mr Godwin walks away saying "I don't know nobody by that name," Stephens pulls out a gun and shoots the 74-year-old at close range. He drops to the ground covered in blood.

As police launched a massive manhunt for Stephens, details emerged about the man he killed. Mr Godwin was a father of nine and grandfather to 14 who worked at a foundry before retiring, his son Robert Godwin Jr told Cleveland.com.

He loved fishing and often went for walks looking for aluminium cans for recycling and was doing just that when Stephens approached him on Easter Sunday.

Godwin Jr  said he last saw his father the morning he was killed when he came by his house to pick up a piece of basketball equipment for one of his other sons.

"He hugged my wife and me and said 'I'll see you guys next time,'" Godwin Jr. recounted. "I said 'OK, enjoy your Easter'."

"I just want him [Stephens] caught ... because he can do it to somebody else."

Cleveland19 News reporter Sharice Dunning posted a video interview with a distraught man and a woman who said the murder victim was their father.

"He's (Mr Godwin) a good guy, he'd give you the shirt off his back ... I hate he's gone, I don't know I'm going to do."

The woman then repeatedly says "I feel like my heart is going to stop."

A $71,000 reward has been offered for Stephens' capture and a Go Fund Me page has been set up for Mr Godwin's family.