ANN ARBOR, Mich. -

Three men arrested in the murder of University of Michigan medical student Paul DeWolf have not yet been charged, but court records show two of the three have had past run-ins with the law.

Paul DeWolf was found murdered in his off-campus apartment this past July.

One 21-year-old suspect was a student at Ann Arbor Pioneer High School. Records show he had been charged in a vandalism incident, as well as being accused of urinating in apple juice that made another student sick when she drank it.

He is currently facing charges of second-degree home invasion and two charges of stealing a financial transaction device.

A 20-yaer-old suspect who was arrested in South Carolina was charged with arson when he was just nine-years-old.

The third suspect is 21 years old. He was also arrested in South Carolina and is awaiting extradition to Michigan. He has no record in Washtenaw County courts.

Police are saying the suspects and Paul DeWolf did not know each other.

Police and prosecutors are not saying when, or even if, the three suspects will be charged.