*Warning: Some of this content is disturbing and very graphic* CLEVELAND (CLARKSVILLENOW) — Police in Ohio are urging residents in surrounding states on Monday to be on alert for a man who they say shot and killed an elderly passerby and then posted a gruesome video of the killing on Facebook. Thirty-seven-year-old Steve Stephens is wanted on a charge of aggravated murder in the death of Robert Godwin Sr. on Sunday afternoon in Cleveland. In a statement early Monday, police warned residents of Pennsylvania, New York, Indiana and Michigan to be on the lookout for Stephens, who they say should be considered armed and dangerous. In a separate video posted on Facebook, Stephens claimed to have killed more than a dozen other people. Police say they have not verified any other shootings or deaths. The FBI is assisting in the investigation. Copyright 2017 The Associated Press