PINELLAS COUNTY – Detectives assigned to the Robbery/Homicide Unit are conducting a shooting investigation in Unincorporated St. Petersburg.
According to detectives, on September 4, 2024, at approximately 8:37 p.m., deputies responded to 5352 79th Street North after several 911 callers reported hearing gunshots. When deputies arrived on scene, they located a black Chevrolet pickup truck parked partially on the property and partially in the roadway. Deputies found 39-year-old Matthew Weisner in the driver’s seat of the truck, suffering from a gunshot wound to the head. Weisner was transported to the hospital with life-threatening injuries.
Throughout the investigation, detectives learned that Weisner is in a relationship with 38-year-old Amber Souza. Weisner and Souza were at Souza’s residence in Pinellas Park and had been consuming alcohol throughout the evening.
Detectives say Weisner and Souza began arguing and Weisner began contacting Souza’s previous boyfriends out of jealousy. When Weisner called Souza’s ex-boyfriend, 36-year-old Michael McMann, Weisner began yelling at him and threatened him with physical harm with a firearm. Weisner also stated he was driving to Michael’s home. Michael was not at home at the time of the phone calls, however, once Michael arrived home, the shooting had already occurred.
Detectives learned when Weisner showed up at the residence, Michael’s brother, 30-year-old Austin McMann, was inside and observed a black Chevrolet pickup truck outside. He thought it may have been involved in a crash due to the speed and angle at which the pickup arrived. Detectives say Austin had never seen Weisner or his truck before and was not aware of who he was. Austin went outside, armed with a personally owned firearm, and demanded Weisner leave the property.
Weisner was yelling angrily and reached into the center console of the truck, Austin heard a sound he felt was consistent with the racking of a gun slide and saw corresponding movement. Austin told detectives he was in fear for his life and fired an unknown number of shots toward Weisner. Austin then returned to his residence and called 911.
Detectives say Austin McMann has cooperated with the investigation and is claiming self-defense. They did not specify if a firearm was located in Weisner’s vehicle.
Weisner remains in the hospital, suffering from a non-survivable gunshot wound to the head. He is currently on life support.