Police say they've mostly wrapped up the investigation of last week's fatal nightclub shooting and may never know the shooter's motive, according to The Associated Press.
Columbus police Sergeant Brent Mull says the department's investigation of the shooting is essentially over except for required evidence collecting when an officer shoots a suspect.
Police say 25-year-old Nathan Gale of Marysville jumped on stage at the Alrosa Villa Nightclub on December 8 and fatally shot four people including former PANTERA guitarist "Dimebag" Darrell Abbott. Police then shot and killed Gale.
Gale's mother says he was a paranoid schizophrenic. Mary Clark said her son was discharged from the Marines last year because of the illness. She also said that she bought her son the nine-millimeter semi-automatic handgun used in the shooting.