NEW ORLEANS -- A man accused of shooting a state trooper with a sawed-off shotgun told him afterward, "You're lucky - you're going to die soon," according to the head of Louisiana State Police.

Senior Trooper Steven Vincent, 43, was fighting for his life after being shot in the head by a man whose pickup truck was stuck sideways in a ditch, Col. Mike Edmonson said Sunday night. "His brain is not telling his body what to do," Edmonson said.

Edmonson said Kevin Daigle, 54, of Lake Charles, was under arrest at a hospital where he was taken after other motorists saw the fallen policeman and wrestled Daigle to the ground.

Senior Trooper Steven Vincent Louisiana State Police

Police video showed Vincent, a 13-year state police veteran in southwest Louisiana and member of a law enforcement family, very professionally trying to talk a man out of the vehicle stuck sideways in a ditch, Edmonson said during a news conference.

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He said the truck door opened and Daigle came out with the shotgun.

"That shotgun wasn't to do anything else but hurt someone. Kill someone," Edmonson said.

He said the tape shows the shotgun blast. "I saw my trooper go backwards and back toward his unit, where he was going to try to get some help out there," Edmonson said.

After the shooting, he said, Daigle wandered into the road and over to Vincent, asking if he was alive.

"You could hear him breathing, telling him, 'You're lucky. You're lucky - you're going to die soon.' That's the words that came out of his mouth," Edmonson said.

He said two or three drivers stopped immediately, one of them spinning around on the two-lane highway.

That driver wrestled the shotgun away from Daigle, and, with the others, got him to the ground, and snapped Vincent's handcuffs on his wrists, Edmonson said. As far as he knew, he said, the good Samaritans were unhurt.

The motorists used Vincent's radio to call other officers to the scene, Sgt. James Anderson, State Police spokesperson for southwest Louisiana, told CBS News.

Edmonson said Daigle had "numerous DWIs" and other arrests that he wouldn't discuss because he didn't know whether they resulted in convictions. Daigle faces charges including attempted first-degree murder of a police officer, Edmonson said.

Sgt. James Anderson, southwest Louisiana spokesman for state police, said Daigle was hospitalized for injuries he suffered while the other motorists subdued him.

"He struggled with the guys who came to assist - had some scrapes on him and so on," Anderson said.

Both Daigle and the trooper who was shot are white, he said.

"It doesn't look good right now so we're asking for prayers," Edmonson said, according to CBS News affiliate WAFB.

Edmonson said Vincent has a wife, Katherine, and a 9-year-old son, Ethan. Edmonson said one of Vincent's brothers is also a state trooper and another is police chief in the nearby town of Iowa.

"His family lives and breathes law enforcement," Edmonson said.

"More than anything else, my trooper needs your prayers," he said. "He's got a long, hard fight. ... He deserves a future - not to die like this."