Witness Carrie Balser said she watched in horror as McComb was pulled off the side of the ATV by Walls and slammed to the concrete face-first.
McComb was hospitalized for three days after the incident. On Saturday, Cedar Grove residents held a candlelight vigil for McComb, who attended.
On Wednesday, Cedar Grove Mayor James Hudnall said the incident remains under investigation. He said Walls was still employed Cedar Grove, but that he was on leave.
Karen McComb, Robert McComb's daughter, said he was still having a hard time walking because of the incident.
"I think he's feeling his age right now," she said Wednesday. "He got around well before this happened. He's not getting around as easy as he used to. Hopefully, that'll get better with time."
Walls went through three other West Virginia police departments and twice received training in Ohio before becoming a fully certified officer, according to information provided to the Gazette by the state Law Enforcement Training (LET) unit of the Division of Justice and Community Services.
He was sued for his actions as an officer in Chesapeake. William Pullen won a $36,000 settlement against the city after accusing Walls of beating him when Walls was an officer there in 2006.
Walls also worked at South Central Regional Jail, said Paul O'Dell, deputy director for the West Virginia Regional Jail and Correctional Facility Authority. Walls worked there from March 1, 2007, through Sept. 19, 2007, when he resigned for personal reasons, O'Dell said.
Reach Gary Harki at gha...@wvgazette.com or 304-348-5163.