Marvin Isley, bass guitarist and the youngest member of the legendary group The Isley Brothers, died June 6 in Chicago from complications of diabetes. He was 56, according to CNN.com.

According to the group’s Def Jam Web site, the original Isley Brothers were formed in the ‘50s with older brothers Rudolph, O’Kelly Jr. and Ronald. By the late ‘60s, the group became formally known as The Isleys and saw success with their recordings “Shout,” “This Old Heart of Mine,” and “It’s Your Thing.” Marvin officially joined the band in 1973.

The full group went on to record “Voyage to Atlantis,” “Harvest for the World” and “That Lady.”

The group briefly disbanded in 1984, with Ronald and Ernie continuing to perform as the Isleys. Marvin rejoined the group in 1991 and continued to perform with the band until he was diagnosed with diabetes in 1997. As a result of the illness, both of his legs were amputated.

The Isleys are often recognized as the only band in history to have successful hit records spanning over five decades.

According to the Rock & Roll Hall of Fame’s Web site, rockhall.ocm, the group was inducted into their prestigious hall of fame in 1992.