MILWAUKEE (AP) — A man was convicted Wednesday of raping three girls and a woman between August 1994 and January 1995 in a case kept alive when prosecutors filed charges based only on a DNA profile.

Rodney Washington, 50, was convicted of seven counts of sexual assault. He could be ordered to spend 190 years in prison when he is sentenced July 7.

The rapist approached the victims — two 14-year-olds, a 15-year-old and a 20-year-old — on the street. He forced them into secluded areas such as alleys, abandoned buildings or woods and then raped them, prosecutors said.

With the statute of limitations about to run out on one of the rapes, Milwaukee County Assistant District Attorney Norm Gahn filed charges in March 2000 against a "John Doe" whose DNA matched that of the rapist.

Washington had been in and out of prison for the past 30 years.

During his latest stint in prison in 2007, Illinois took a DNA sample from him, and a year ago his DNA profile was matched to evidence gathered after the rapes.