Darryl T. Mantz

Mantz and his shooter, Reginald O. Allen, worked together rehabbing homes. After Allen shot Mantz, he went on a crime spree that included other shootings, a getaway Bobcat and the theft of a police patrol car, authorities said. Allen then drove away on the same Bobcat — a piece of construction equipment also known as a skid steer — that he'd driven to the home on McBride. He smashed the vehicle into a fence as he was headed toward Interstate 255, police said, and abandoned it under the highway. When a Dupo police officer confronted him, Allen shot the officer in the shoulder and neck and stole the officer's car, authorities said. At some point during an hourslong standoff at Allen's home, Allen died of a self-inflicted gunshot wound, said Master Sgt. Brad Clossen of the St. Clair County Sheriff's Department. The Dupo officer was in critical condition Monday at a St. Louis hospital but is expected to survive, said Dennis Plew, the police chief of Dupo. The officer is 49 and has been in law enforcement for 12 years, including stints with the Roxana and Cahokia police departments. "He's looking at more surgeries down the road," Plew said. "He should have a full recovery, it's just going to be over a long, long period of time.' Allen was found dead inside his garage at 769 McBride Avenue. When Allen stole the officer's car, the officer's rifle was still inside of it. He parked the vehicle in his driveway, then barricaded himself in his home. Police surrounded Allen's home and got a warrant to search it. At about 9:20 p.m., they went inside and didn't find him. Then police entered the garage and found Allen dead of a self-inflicted gunshot wound, Clossen said. No shots were fired at officers during the standoff. Police don't know how soon into the standoff Allen killed himself. They found the AR-15 next to his body, Clossen said.