Wikipedia article

Mark Tulin, born Nov 21, 1948, was known primarily as the bassist for The Electric Prunes, a psychedelic band active in the mid-late 1960s. The band experienced a resurgence in popularity during the 90s, and re-formed in 2001.

Following some collaborative work in 2008-09 between Billy Corgan and Sky Saxon of The Seeds, and Saxon's subsequent death in June 2009, Tulin joined Billy's Sky Saxon tribute band Spirits in the Sky, who played several shows in 2009, as well as the Backwards Clock Society, a one-time-only Pumpkins spin-off band for a fundraiser show. He also played bass on the first Teargarden By Kaleidyscope EP, "Songs for a Sailor".

After Ginger Pooley left the Pumpkins in 2010, Mark Tulin was announced as a temporary live bassist. He played a single show with the band, on Record Store Appreciation Day (April 17), 2010, before Nicole Fiorentino was hired as a permanent member.

On February 26, 2011, while helping out at the Avalon Underwater Clean-Up in Avalon, CA, Tulin collapsed. He was unable to be revived, and was pronounced dead.

His twitter feed can still be viewed, which includes some details about his work with the Pumpkins.