Even though he is still close to the Simpson family, Joe had to let him go from the film because he was set to play a character who was continually drunk.
Garrison was involved in a car crash earlier this month that killed Vahagn Setian, 17, and injured two other passengers.
Alcohol is thought to have been a factor in the crash.
This is the latest trouble that Garrison has faced. Just one week after the crash, someone stole his identity and wiped out his entire bank account.
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