Authorities arrested Trey Sesler around 9:30pm Tuesday in the Magnolia area after officials with the Texas Department of Public Safety and Texas Rangers spotted his 2010 black Mustang.
He is accused of fatally shooting his parents, Lawton and Rhonda Sesler, as well as his 25-year-old brother, Mark Sesler.
Officers discovered the victims' bodies of at their home in the 1600 block Farr Street around 1:30pm Tuesday after they were asked by concerned family members to check on their well-being.
"Upon walking up to the house and a deputy looked through the window, the blinds and all were open and they observed one male laying partial on the bed and the floor and appeared to be deceased," Waller County Sheriff Glenn Smith said.
Authorities say the home also was ransacked.
Authorities believe the victims may have been killed as early as Monday because officers were dispatched to the neighborhood on Monday afternoon after several residents reported hearing gunfire. But when they arrived, they couldn't find any signs of a shooting so they cleared the scene.
But after Tuesday's discovery, Sesler was nowhere to be found and became a suspect in the case. Authorities were eager to capture him because they feared he was heavily armed and possibly wearing body armor. However, he was arrested without incident.
We're told the Sesler family was well liked, and there were no prior domestic disturbance calls.
Both Lawton and Rhonda Sesler were in their 50s. Lawton had worked as a teacher at a Cy-Fair elementary school for years. He was well-known at Robison Elementary School. In an online posting, he wrote that he worked for Cy-Fair ISD for 17 years. He and his wife, Rhonda, had been married for 34 years.
Both the Waller Police Department and the Waller County Sheriff's Office are investigating.
Sesler is expected to go before a judge this afternoon.