Former "Prison Break" actor Lane Garrison will plead guilty to vehicular manslaughter for a crash that killed a 17-year-old boy who was a passenger in his car, his attorney said Wednesday.

Garrison, 26, will make the plea on May 21 in Superior Court, attorney Harland Braun said after a hearing at which Garrison's arraignment was postponed. Braun said Garrison might plead guilty to some other charges, too.

The charges carry up to six years and eight months in prison. Garrison remains free on bail.

"He's fairly accepting," Braun said. "He realizes that he has to step up and take responsibility for what he did."

Garrison was driving a 2001 Land Rover that jumped a curb at about 50 mph and hit a tree Dec. 2, police said.

Beverly Hills High School student Vahagn Setian was killed. Two 15-year-old girls also in the car were injured.

Police said Garrison had a blood-alcohol level of .20 percent and cocaine in his system. The charges only indicate that his blood-alcohol level was above .15 percent.

He was accused of felony vehicular manslaughter while intoxicated, felony driving under the influence causing injury to multiple victims, felony driving with a blood-alcohol level above the .08 percent legal limit causing injury, and a misdemeanor count of furnishing alcohol to a minor.

Braun said that in addition to manslaughter, his client may plead to some of the other charges and attempt to have others dropped under plea negotiations.

However, Braun said "there will be no agreement on sentencing," which will be left up to the judge.

Braun said he is waiting for experts to provide reports on Garrison's blood-alcohol level at the time of the crash and on the condition of the vehicle, which had been the subject of a recall for brake problems.

If a mechanical problem contributed to the crash, that might affect Garrison's sentencing, Braun said.

"We're not trying to shift blame," Braun added.

Braun said Garrison told him: "I'm the lucky one. I'm alive. The other guy is dead. ... How can I feel sorry for myself in a world where guys are going off to Iraq?"

Garrison, a Dallas native, played David "Tweener" Apolskis in "Prison Break," a Fox hit series. His character was killed in an episode last year.