The actor insists he'll feel guilty for the rest of his life.
Garrison was driving his Land Rover Sports Utility Vehicle in Beverly Hills with three teenage passengers when the vehicle struck a tree.
Vahagn Setian, 17, was taken to the hospital where he was pronounced dead. Two other young females were also injured in the crash.
Speaking out about the tragedy for the first time, Garrison tells People magazine, "I pray every day for all the families involved... I realize I will live with a sense of guilt for the rest of my life."
The actor, who was found to have cocaine in his system and was driving drunk at the time of the fatal accident, was charged last week with one felony count each of vehicular manslaughter while intoxicated and without gross negligence, driving under the influence causing injury to multiple victims, and driving with a .08 percent blood alcohol level causing injury.
He was also charged with one misdemeanor count of furnishing alcohol to a minor.
Garrison is due back in court April 11 to enter a plea and faces up to six years and eight months in state prison if convicted.
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