Sky "Sunlight" Saxon, frontman and bass guitarist of '60s psychedelic garage-rockers The Seeds [ tickets ], has died in an Austin, TX, hospital.

Saxon had been hospitalized in critical condition at St. David's Hospital since Monday (6/22) with what his doctors believed to be an infection of the internal organs. A cause of death has not yet been confirmed for the singer, whose actual age was unknown, and who listed his birth date variously as 1937, 1945 and 1946.

Saxon's wife Sabrina posted news of the performer's death on Facebook Thursday morning. "Sky has passed over and YaHoWha is waiting for him at the gate. He will soon be home with his Father. I'm so sorry I couldn’t keep him here with us. More later. I'm sorry."

The singer, born Richard Marsh in Salt Lake City, UT, began his career in the early '60s as a doo-wop performer, billing himself as Little Richie Marsh. After becoming Sky Saxon and forming a series of unsuccessful bands, he hit on the right formula with The Seeds in 1965. The band produced several mid-decade hits, including "(You're) Pushin' Too Hard," which broke into the Top 40 in 1967.

Saxon struggled through a number of personnel changes with The Seeds while the band's commercial potential deflated; the group released its last major-label album in 1970 to little notice.

Afterwards, Saxon joined the Yahowha religious sect in Los Angeles and, along with other members of the group, to released several albums in the early '70s as the Yahowha 13. It was during this period that Saxon adopted "Sunlight" as his spiritual name.

Saxon continued to tour and record music over the years, working with newer bands like Redd Kross and Chesterfield Kings in the '80s before reforming The Seeds in 1989 to headline the Summer of Love Tour, which also featured Big Brother and the Holding Company, Arthur Lee, and Love and the Strawberry Alarm Clock, among other acts.

A second revival in 2003 included original guitarist Jon Savage, who departed midway through the band's 2003 European tour due to failing health. The group had continued on ever since, with Saxon remaining as the sole original member.

The performer, who was scheduled to take part in the '60s-nostalgia California '66 Revue tour this summer along with The Electric Prunes and Love, had taken to the stage as recently as Saturday (6/20) at Austin nightclub Antone's with recent collaborators Shapes Have Fangs.