The musician passed away in his sleep on Sunday, his cousin and bandmate Billy Jones told Dayton.com.
Keith was suffering from health issues at the time but a specific cause of death has not been revealed.
Heatwave were most famous for their top disco hits Boogie Nights, The Groove Line and Always and Forever.
The group formed in 1975 after Keith’s brother, Johnnie Wilder Jr. asked him to join him and British songwriter Rod Temperton to tour the London nightclub circuit.
GETTYKeith Wilder has passed away aged 65 in his sleepRelated articles
GETTYKeith Wilder was suffering from health issues at the time
In 1976, the band released their debut album Too