Lane Garrison played an inmate in Prison Break. Now he's going to be one in real life—at least for the next three months.

Beverly Hills Superior Court Judge Elden S. Fox ordered the 27-year-old actor sent to a California prison for 90 days Thursday while Fox mulls a final decision on the sentence to be imposed in the case.

"We don't have all the information. I intend to remand Mr. Garrison today to the Department of Corrections for diagnostics," Fox said.

While in custody, Garrison will be evaluated by prison staff and psychiatrists who will determine whether he is a suitable candidate for probation. If he is found suitable, he could be released at the end of the 90-day period.

Garrison pleaded guilty in May to felony charges of vehicular manslaughter and drunken driving stemming from his deadly crash in December 2006.

He could face a maximum penalty of six years and eight months behind bars when he is sentenced on Oct. 31. 

Garrison was behind the wheel of his SUV on Dec. 2 when it jumped a curb, killing 17-year-old Vahagn Setian and injuring two 15-year-old female passengers. The actor suffered only minor injuries in the accident.

Speaking before the judge handed down his verdict Thursday, a shaken Garrison expressed his remorse for the events of that night.

"This is an out-of-body experience for me," he said. "I've relived that night every day and have thought about bad decisions.

"We can't bring him back, but I just want to apologize to everyone," the actor continued. "I'm sorry for my behavior that evening. It doesn't represent who I am usually."

Garrison also denied that the emotional public service announcement he released earlier in the week was a publicity stunt and claimed he had tried to contact Setian's family repeatedly to apologize.

"All I can say to you is that I'm sorry. I tried to contact you every day," he said.

Setian's parents took the stand before Garrison and expressed their devastation over the loss of their son: "The meaning of our lives was taken away. He was our only child."

Setian's father called Garrison "selfish," and contradicted the actor's claim that he tried to reach out to the family.

"He took no responsibility. He could have come to us the next day and apologized, but he didn't," the grieving father said.

"Yesterday was one of the hardest days. It was Vahagn's birthday. He would have been 18."

Both of the female passengers also took the stand Thursday, one testifying that Garrison tried to cover his tracks by claiming Setian was driving at the time of the crash.

Michelle Ohana, who was hospitalized and had to use a wheelchair for two months after the accident, said she was floored by Garrison's untruths.

"I was in shock when I heard Vahagn was driving. How could he lie to me when I was in the hospital?" she said.

The other victim, Chen Sagi, said Setian only accompanied her and her friend in Garrison's car because he "didn't want the two girls to go with a strange guy."

The actor's troubles reportedly began when he encountered a group of teenagers, including Sagi, at an L.A. supermarket earlier that night and agreed to accompany them to a party.

At the time of Garrison's arrest, Braun said the actor had one drink at the party and left to meet a friend, allowing the three teens to tag along. His next memory, the lawyer claimed, was of waking up in the hospital with a cab voucher in his lap.

On Thursday, Braun suggested Garrison may have been given a drink spiked with GHB, also known as the date rape drug, at the party.  

Meanwhile, witnesses from the party had a slightly different version of events, telling TMZ that Garrison took "several shots" from a bottle of Grey Goose vodka he brought with him and that he was actually on his way to buy more alcohol for the party at the time of the crash.

A police investigation revealed that Garrison registered a blood alcohol level of 0.20—two and a half times the legal limit—at the time of the crash and tested positive for cocaine.

Braun said in April that his client was prepared to accept culpability for his actions.

"Mr. Garrison's attitude is basically, 'Look, I did something wrong, I'm going to face up to my responsibilities, and I'm going to accept my punishment,' " Braun said at the time.

In his PSA, released this week, the actor discourages others from making the same mistakes he did.

"Just don't drink and drive. It's not worth it. It's just not worth it. I know, because it happened to me," Garrison says in the video, tears filling his eyes.