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

Jeffrey Doyle Robertson 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, the Canton police chief, Mike Echols, said.

Mr. Robertson, 45, went to the school just after classes started and shot coach Gary Joe Kinne 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.

Mr. Robertson’s pickup was found about two hours later abandoned on a rural road next to a golf course a few miles outside town. Mr. 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, Mr. Echols said.

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

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

Mr. 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, Mr. 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.

Mr. Smith’s father described Mr. 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.”

Mr. Smith said he complained to the school and police, but Mr. Robertson was never charged. Mr. Echols and Canton school district Superintendent Larry Davis said they were unaware of any previous threats.