UPDATE: A murder warrant was issued for Manuel De Los Reyes Galeas Wednesday night.
ATASCOSA COUNTY -- Authorities are on the lookout for a 19-year-old man after a former Atascosa County commissioner was found murdered early Wednesday morning.
Tommy Shearrer, 56, was found fatally shot inside his pickup truck on St. Augustine Road between Farm Road 3006 and U.S. 281 -- about four miles north of Pleasanton.
The scene of the crime is within a mile of Shearrer's home, investigators said.
Authorities are looking for a man they called a "person of interest" in the case. They said they believe Manuel De Los Reyes Galeas, 19, may have witnessed the murder.
Galeas has also been connected to an alleged shooting in southern Bexar County earlier the same day. His girlfriend told investigators he shot at her as she ran into her home.
"It's pretty scary, because it's quiet around here. Everyone knows everyone," said Erica Martin, who lives two houses down from where the shots were fired.
Bexar County Sheriff''s detective, Louis Antu, said Galeas will face charges of aggravated assault with a deadly weapon.
Atascosa County Deputy Chief David Soward said they believe Galeas was present when Shearrer was killed, although they are not calling him a suspect at this time.
"He was in the area and we need to see what he saw," Soward said. "As far as any other details, I'm not at liberty to release."
Shearrer served as Atascosa County commissioner in the late 1990s and had been a prominent business man and rancher.
Abraham Saenz, Shearrer's life-long barber and friend, said Shearrer was an honest and hard-working person.
"Everybody is in the same dark cloud right now," he said. "Can't figure out why that had to happen to Tommy."
In February, Shearrer sat down with KENS 5 to discuss his latest cloud seeding venture as project manager for the South Texas Weather Modification Program.