Boulder County Police / .
Boulder County Police / .

"Family Ties" actor Brian Bonsall was arrested on Saturday after allegedly attacking a pal, until police realized he's been wanted for more than a year for another crime.

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The former child star, who played Michael J. Fox's little brother on the hit '80s sitcom, is said to have hit Michael Trujillo in the face with a splintered bar stool during a night of heavy drinking at his friend's Colorado home.

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Concerned neighbors alerted authorities, who booked the 28-year-old at the scene despite his claims he had no recollection of the brawl, according to the Colorado Daily.

A police report obtained by the publication reads, "Bonsall said that he and Trujillo both are bipolar and like drugs. Bonsall said that he takes a lot of drugs and sometimes those drugs make him forget things."

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Officials then discovered Bonsall has been wanted since July 2008 after he failed to appear at a hearing for allegedly violating his probation linked to a 2007 assault charge.

He is currently behind bars at Boulder County Jail.