Greg Lake, member of both King Crimson and Emerson, Lake and Palmer, has died after a long battle with cancer, BBC reports. The news was relayed by Lake’s manager. The musicians’ passing comes just months after his bandmate, Keith Emerson, died of an apparent self-inflicted gunshot wound in March.

Lake was a co-founder of King Crimson with guitarist Robert Fripp, who brought Lake into the fold as bassist and singer. The band released their debut album, In the Court of the Crimson King, in 1969, and the record has become a staple of the progressive rock canon. Lake later formed a relationship with keyboardist Emerson and eventually left King Crimson to help form Emerson, Lake and Palmer, who made their live debut in 1970. Lake also had some success as a solo artist, including his holiday tune “I Believe in Father Christmas,” which he wrote in 1975.

Lake’s website includes clips of the musician speaking on various topics, along with the message from Stewart, who writes, “Greg Lake will stay in my heart forever, as he has always been.” Watch Emerson, Lake and Palmer in a 1977 concert below.