CLEVELAND  Cleveland police have said the search for a murder suspect has gone national and believe the suspect is still armed.

Cleveland police chief Calvin William says his department is 'leaving no stone unturned' and are following up on all investigative leads.

Monday afternoon, Cleveland mayor Frank Jackson said there's a $50,000 reward for information leading to Steve Stephens' arrest.

A warrant for aggravated murder has been issued for the suspect believed to have shot and killed a man in a video posted to Facebook Sunday afternoon.

As the manhunt for Stephens expands, Cleveland police detectives were able to make contact with him early in the investigation.

"They tried to convince him to turn himself in," Cleveland Police Chief Calvin Williams said.

The contact was made on a cell phone.

"We don't know his condition, and we don't know his location," Williams continued before adding there are many false reports about the case appearing on social media

VERIFY: False information circulating in manhunt for Steve Stephens

Stephens, 37, is wanted for aggravated murder in the Easter Sunday shooting death of a 74-year-old man, which happened at 695 East 93rd Street. The victim was identified as 74-year-old Robert Godwin, Sr.

When pressed about rumors that Stephens' cell phone had pinged in Pennsylvania, Chief Williams said his last confirmed location was at the murder scene.

"We're still asking Steve to turn himself in, but if he doesn't we'll find him," Williams said while adding they won't stop "until he's in custody."

NEW: Steve Stephens Search Expanded to Other States

Anybody with information is urged to call 911 immediately. A national tip line has also been established: 1-800-CALL-FBI.

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"If you're a friend or family member, and you have contact with Steve and you think you're helping him, the only way to help him is to give us the information or convince him to turn himself in," Williams added.

Although Stephens claimed responsibility for additional killings, authorities have only confirmed one victim.