Grace Slick is mourning the death of one of her original Jefferson Airplane band mates and former lovers. Paul Kantner died on Thursday of multiple organ failure following a heart attack he suffered earlier in the week. Kantner was 74.

In 1970, we spoke with Paul Kantner and Grace Slick about co-piloting the Jefferson Airplane https://t.co/h8vUhSmzNH pic.twitter.com/aJU8Ep6vWS

— Rolling Stone (@RollingStone) January 29, 2016

Taking to social media, Grace Slick shared a few words in honor of her dear friend.

Paul Kantner is the first of the Jefferson Airplane band members to die. He was one of the founding members of the band’s spinoff, Jefferson Starship, in 1974.

Grace Slick sang lead vocals for Jefferson Airplane, Jefferson Starship, and Starship, as the band was known in later years. The early songs detailed life with sex, psychedelic drugs, and communal living. They played at both Monterey and Woodstock music festivals.

“Somebody to Love” and “White Rabbit” are the cumulative bands’ biggest hits, and feature Grace Slick on lead vocals.

Grace Slick isn’t the only person from the music world grieving Paul Kantner’s passing.

Paul Kantner was no less than one of the very few spokesmen for the entire hippie generation. Smart and funny with a deep rebel streak. Huey

— Huey Lewis (@Huey_Lewis_News) January 29, 2016

Paul Kantner had a big impact on all of us who grew up in the Bay Area. His spirit will live on, of course, but he will be missed. – Huey

— Huey Lewis (@Huey_Lewis_News) January 29, 2016

Paul Kantner was my friend,roommate, pal..we wrote Wooden Ships together with Stephen
I'm going to miss him

— David Crosby (@thedavidcrosby) January 29, 2016

Grace Slick and Paul Kantner have a daughter, China Kantner, who was born in 1971.

Grace Slick to Paul Kantner: 'Rest in Peace My Friend' https://t.co/wytu0EpvUo pic.twitter.com/VpLovaeOYb

— billboard (@billboard) January 29, 2016