Lucien Rolland, who led police from several agencies on a chase back and forth between St. Tammany Parish and New Orleans early Saturday morning before being shot by deputies on a highway overpass in Slidell, was struck 18 times by bullets to the chest, abdomen, pelvis and limbs, a St. Tammany Coroner’s Office spokesman said Monday.

Rolland was hit by bullets of several calibers and the damage to his internal organs was such that it was impossible to determine which shot or shots were fatal, the spokesman said.

During the 45-minute chase, which began in St. Tammany, Rolland traveled across the U.S. 11 bridge into Orleans Parish before heading back into St. Tammany on Interstate 10.

He fired several times at deputies along the way before stopping on the interstate in Slidell and getting out of his car with a semiautomatic handgun, Sheriff Jack Strain said Saturday.

Officers from the St. Tammany Parish Sheriff’s Office, Louisiana State Police and Slidell Police Department all fired at Rolland, who was pronounced dead at the scene.

Rolland’s white pickup had several bullet holes in the tailgate and at least one in the passenger’s side.

A passenger who was in the car with Rolland when the chase began but who soon jumped out has been interviewed by deputies investigating the incident, said Capt. George Bonnett, a Sheriff’s Office spokesman.

The passenger, who has not been identified, is cooperating with detectives and has not been booked in relation to the incident, Bonnett said.

The incident began when a St. Tammany Parish Sheriff’s Office deputy tried to pull Rolland over about 2:30 a.m. Saturday as the pickup drove slowly down Pontchartrain Drive near Slidell.

But when the deputy turned on his lights and siren, Rolland sped up and fled south toward Lake Pontchartrain. His passenger jumped out near the lake.

Rolland crossed Lake Pontchartrain on U.S. 11, and New Orleans Police Department officers assisted in the chase when he got to the south shore. He then got on I-10 and headed back toward Slidell.

State troopers were able to puncture one of his tires near the Old Spanish Trail exit, but he continued north to Gause Boulevard, where he stopped and got out of the car brandishing a gun, Strain said.

Six St. Tammany Parish Sheriff’s Office deputies, one Slidell police officer and one state trooper have been placed on some type of administrative duty after the shooting, in accordance with the policies of their respective agencies, various spokesmen said.

None of the agencies released the names of the officers involved.

The incident caused the closure of eastbound I-10 for several hours Saturday as deputies investigated the incident.

A search of public records showed misdemeanor convictions for Rolland in Utah, and he was scheduled to stand trial in St. Tammany later this year for a second-offense DWI.

Follow Faimon A. Roberts III on Twitter, @faimon.