Charleston County sheriff's deputies are asking for help in finding the person who shot a man and left him lying between an abandoned house and a van the victim slept in.

Robert Rockey Williams, 21, was shot multiple times. He died about 2 a.m. Sunday at Medical University Hospital.

Deputies responding to a call of shots fired found Williams lying in front of 1749 Dillway St., next to a friend's Dodge van that he used to sleep in.

Lying next to him was a 9 mm handgun with a scratched-off serial number, according to an incident report. Maj. John Clark said investigators don't think the black High Pointe pistol was the weapon used to shoot Williams.

Witnesses told deputies they heard gunshots and then saw a black man running through the Wind Jammer Apartments wearing blue-jean shorts, brown high-top boots and carrying a white shirt, according to the report.

Witnesses said Williams was "pretty much homeless" and recently had been sleeping in the Dodge van.

He was convicted of possession of a stolen vehicle in 2007 and possession of a controlled substance in 2009, according to a State Law Enforcement Division records check. He also was charged by North Charleston police in September 2009 with possession with intent to distribute cocaine. Those charges were still pending at the time of his death, according to the Charleston County Clerk of Court website.