Kool & the Gang co-founder Dennis Thomas, often referred to as “Dee Tee,” has died. He was 70 years old.

Thomas passed away in his sleep in New Jersey on Saturday, according to a statement posted to the Grammy Award-winning band’s verified Facebook page.

Born in Orlando, Florida, Thomas was a longtime resident of Montclair, New Jersey, the band said in its in memoriam post.

Thomas, “known as the quintessential cool cat in the group, loved for his hip clothes and hats, and his laid-back demeanor,” is survived by his wife, daughter, and two sons, the statement said.

Along with his long list of instrumental talents as a saxophone player, flutist, and percussionist, he was also in charge of styling the R&B group and was the “master of ceremonies” at their shows, according to the statement.