A medical researcher has been sentenced to five years in prison in the case of a western Michigan man who disappeared in 2007.

Raogo Ouedraogo (RAH'-go qua-DRAH'-go) was a researcher at Thomas Jefferson University in Philadelphia when he was arrested in 2009. He was convicted of conspiracy for a plot with a college pal to kidnap a 66-year-old Ionia County retiree, Donald Dietz.

Judge Janet Neff sentenced Ouedraogo in Grand Rapids federal court on Tuesday. He'll get credit for 31 months spent in jail. The judge had thrown out the 2011 jury verdict, but an appeals court last year reinstated convictions on two charges.

Dietz is presumed dead. Co-defendant Rami Saba is serving a 32-year prison sentence.

Prosecutors say the motive was money. Ouedraogo told the judge he's ``completely innocent.''