A man who shot himself during a police stand-off on a Reno freeway was wanted for being a convicted sex offender and not registering his address, authorities said.

Records also show Ricardo Rivas-Ramirez, 32, previously threatened to shoot himself during disputes and had restraining orders against him filed by girlfriends.

Washoe County's medical examiner on Monday determined Rivas-Ramirez died of a self-inflicted gunshot wound to the chest.

Rivas-Ramirez was pulled over around midnight Friday on Interstate 80 by a Nevada Highway Patrol sergeant for driving a Jaguar more than 90 mph, Reno Police Lt. McDonald said.

He crashed the car into a concrete wall and got out pointing a gun to his head, McDonald said. He fired one shot into the air, then barricaded himself in his car while officers tried to get him to surrender.

After eight hours, SWAT officers fired tear gas into his car and found him dead.

On Sunday night, NHP troopers took a 27-year-old woman claiming to be Rivas-Ramirez's fiance into civil protective custody after she became belligerent while placing a makeshift memorial on the freeway.

Trooper Chuck Allen said the woman was grossly intoxicated and refused to leave.

"We are empathetic to the loss of a loved one, but we also have to look at public safety," Allen told the Reno Gazette-Journal.

Records show an arrest warrant was issued last April charging Rivas-Ramirez with failure to register his address as a sex offender.

In 2000, he pleaded guilty to felony statutory sexual seduction and was sentenced to one year to 32 months in prison.

In February 2008, a former and current girlfriends sought restraining orders against him in Washoe County, saying he had firearms and had battered them, the newspaper reported Tuesday.

The mother of his now 1-year-old daughter reported Rivas-Ramirez pulled a gun when detectives came to their home last year to talk to him.

"He was yelling he wasn't going to shoot anybody but him," Maria Castro wrote in her Feb. 13, 2008, request for a protection order.

Dory Palczewski, a former girlfriend, wrote in her Feb. 4, 2008, request that despite having separated from him a year earlier, Rivas-Ramirez began stalking her and constantly threatened to shoot or stab her.