Trooper Chad Walker dies after roadside shooting near Mexia Texas Department of Public Safety Trooper Chad Walker was shot as he pulled over to assist a stranded motorist. (Source: Texas DPS) By Stephanie Frazier | March 31, 2021 at 8:50 PM CDT - Updated March 31 at 11:00 PM AUSTIN â The Texas Department of Public Safety has released a statement about the death of Trooper Chad Walker, who was shot by a suspect heâd pulled over near Mexia on Friday. The full statement from DPS follows: It is with great sadness the Texas Department of Public Safety (DPS) announces the death of a Highway Patrol Trooper following a shooting incident in Limestone County.