MADISON (WKOW) -- An arrest warrant was issued for a fourth person who police believe was involved in the attack on Montee Ball.
Authorities are looking for 27-year-old Karlis Griffin.
Court records show he's charged with felony substantial battery.
Ball, the UW football star, was beaten up as he walked home on University Avenue in August.
Two other men were placed in a deferred prosecution program.
A third is due for sentencing on Friday.
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