redshirt freshman jc jackson , 19 , was arrested on saturday in gainsville .
he and two men entered an acquaintance 's apartment , but jackson left after the other men pulled out a gun and demanded money and drugs .
jackson turned himself in after being identified in the police report .
he was booked into alachua county jail and held on a $ 150,000 bond .
police are still investigating the identities of the other suspects .