The former child star allegedly beat Michael Trujillo in the face with a splintered chair during a night of heavy drinking at his friend’s Colorado home.
After concerned local residents called authorities, Bonsall was booked at the scene – only for cops to realise he had been wanted for more than a year after missing a court hearing in 2008.
He had allegedly violated terms of his probation stemming from an assault on his girlfriend in 2007.
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Bonsall, best known for playing Michael J. Fox’s little brother on the hit ’80s sitcom, is currently being held in Boulder County Jail on $7,500 (£4,687) bail.
He faces up to six years behind bars if he is convicted of assault.
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