EL CAJON (KGTV and wire reports) - El Cajon police are investigating the shooting death of a man that resulted following an argument along a busy street Thursday.
Police said gunfire erupted in the 1400 block of East Main Street in El Cajon shortly before 9:30 a.m., about a mile west of Granite Hills High School.
Witnesses told 10News that two men were arguing on the sidewalk when one man took out a gun and shot the victim.
According to police, an initial investigation indicates that an off-duty security guard tried to stop either a vehicle burglary or a carjacking. At some point, the vehicle's owner got involved, shooting and killing the suspect, police say. The shooter stayed on scene and cooperated before being arrested.
Officers closed the street between Madison Avenue and Walter Way to allow investigators to document evidence.
Anyone with information is asked to call the El Cajon Police Department at 619-579-3311.
City News Service contributed to this report.