A West Bloomfield man has been sentenced on a sexual assault case that dates back more than 25 years. 

Kurt Alan Rillema, 52, pleaded no contest in December to criminal sexual conduct in the third and fourth degree regarding an assault that happened in September 1999, the Oakland County Prosecutor's Office reported in a press release Thursday. 

He was sentenced Wednesday to 10 to 15 years in prison. 

"The Oakland County Prosecutor's Office only consented to the plea agreement after consulting the victim and obtaining her approval," the press release said. 

Genetic genealogy testing of DNA evidence connected Rillema to the case, in which a woman, then 22 years old, was sexually assaulted at Twin Lakes Golf Club in Oakland Township. Investigators did obtain DNA at the time, but didn't have a suspect. 

Investigators eventually made the connection through DNA evidence collected on a July 2000 case involving another woman, then 19, who was attacked at a golf course at Penn State University. Investigators in both states sought the help of DNA technology company Parabon NanoLabs, which can use genetic genealogy and other research methods to search for potential relatives in public databases and build out family trees.  

Through that research, the potential suspects were narrowed to three individuals. 

The next break in the investigation happened after Michigan police obtained a DNA sample of Rillema through a Styrofoam coffee cup he had used. 

The Oakland County Sheriff's Office Special Investigations Unit worked with police from Penn State and State College, Pennsylvania, on the case. 

"Rillema will serve serious prison time for his crime," Oakland County Prosecutor Karen McDonald said in the announcement. "I know reliving this trauma after so many years wasn't easy for the victim. Her strength sustained this case, and I applaud the relentless work by law enforcement that allowed us to deliver a just ending for her.