MUSKEGON, MI - A 55-year-old mother of a rape suspect is accused of threatening one of her son's alleged victims.

Lynette Sue Humphrey

Lynette Sue Humphrey, the mother of Joshua Matthew-Rolling Humphrey, allegedly threatened in a voice mail message to "beat up" one of her son's alleged victims. Joshua Humphrey, along with Larry Donell Stiff, has been charged in the "date-rape drug"-related rapes of two women in the Muskegon area.

Lynette Humphrey, of 613 Taffy Lane, was charged last week with witness intimidation as a third-time habitual offender and is lodged in the Muskegon County Jail on a $20,000 bond. She faces up to 20 years in prison.

Joshua Humphrey, 34, and Stiff, 31, have been charged with third degree criminal sexual conduct involving a Feb. 7, 2016 incident with one woman, and as first-degree criminal sexual conduct accomplices in an incident involving another woman in 2013. They were charged in March for the 2016 case, and on July 8 for the 2013 case.