The father of a high school football player shot and wounded the team's coach Thursday, then fled in a truck loaded with weapons and tried to kill himself by slashing his wrists, authorities said.

Jeffrey Doyle Robertson (search) had been barred from Canton High and told not to attend football games after several confrontations, including "shoving and verbally abusing" coaches at the annual football picnic, Canton Police Chief Mike Echols said.

Robertson, 45, went to the school just after classes started and shot coach Gary Joe Kinne (search) in the chest, apparently with a .45-caliber pistol, police said. The coach, who also is the school's athletic director, was airlifted to a hospital in nearby Tyler, and a family spokesman said he was in critical condition.

Robertson's pickup was found about two hours later abandoned on a rural road next to a golf course a few miles outside town. Robertson was later found in the woods with self-inflicted wounds, including cuts to his wrists and a punctured thigh, authorities said. He had two guns and a pocket knife with him, Echols said.

Authorities were trying to get a warrant to search Robertson's truck, where several more guns were visible.

Television footage showed Robertson being carried to an ambulance on a stretcher. A balding man with a goatee, Robertson has a tattoo on his arm of cartoon character Yosemite Sam (search) brandishing two guns and the words "Born to Raise Hell."

Robertson was treated at a hospital, then transported to a jail to await charges, authorities said. He was expected to be arraigned Friday morning.

Police were investigating a possible motive. On Wednesday, Robertson's son, Baron, had apparently been banned from playing all school athletics, said Steve Smith Jr., a senior who was a defensive end and kicker on the team.

Smith's father described Robertson as "a very high-strung, hot-tempered individual" who threatened Smith Jr. last year -- grabbing his shirt and pushing him up against a fence -- over an on-field teasing. He said Baron Robertson, then a freshman, was walking off the field when some older students "razzed" him.

"This guy blew up," Steve Smith Sr. said. "He thought some kids were picking on his son. My son wasn't even the one who said anything. But he threatened to kill him."

Smith said he complained to the school and police, but Robertson was never charged.

Echols and Canton school district Superintendent Larry Davis said they were unaware of any previous threats.

Some parents had been upset that Kinne had made his own son the starting quarterback as a freshman, Smith Sr. said. G.J. Kinne was the AP 3A all-state honorable mention quarterback last season.

Rhonda Miller, a cousin of Robertson's wife, was among the relatives gathered outside the jail Thursday night to help support Robertson's wife and son.

Miller said she didn't want Robertson portrayed as "a lunatic" because he wasn't the only one frustrated with the school's athletic program.

"A lot of parents are upset. This is not a single incident, and if they don't take care of it, it could escalate," she said, declining to elaborate.

Robertson worked for six years for Dallas Plumbing Co., leaving in 2002 to start his own business with another man. Company President John Downs described Robertson as a good employee and a devoted father who enjoyed taking his son hunting and fishing.

The last time Downs saw Robertson was about six months ago, when Robertson had a broken leg, bruises and abrasions from a road-rage-related fight on the side of a highway, he said.

"The last conversation that I had with him was that he really needed to learn how to control his temper or he was going to get hurt worse than that," Downs said.

The state's Homeland Security Office had alerted state officials about the possibility that Robertson had a hit list.

Echols said officers found no hit list on Robertson, but added, "We had heard there were certain people he named off that he wanted" to harm.

Canton is a town of about 3,500 some 60 miles east of Dallas, and is known for holding a massive flea market each month.