Alan Sacks, known for co-creatingWelcome Back, Kotterand producing severalDisney Channelprojects, has died.

After that, the chemotherapy stopped being effective.

He started hospice last week.

Alan Sacks

Alan SacksAlan Sacks / Getty Images

He died peacefully listening to Tibetan music for the final few days and nights at age 81.

Alan was the creator of the #DAGGERS and #theramplocals.

He along with Paul Brown wrote the screenplay and lived the dagger life every day on set.

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(L-R) Kevin Hooks & Alan Sacks attend the 32nd annual NAACP Image Awards in 2001J. Vespa/WireImage

Alan lived his life like a dagger every day since.

He was an OG punk rocker.

Alan will be missed and remembered forever.

DAGGERS 4 LIFE RIP Ol friend.

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Born December 9, 1942, Sacks co-createdWelcome Back, Kotterwith Gabe Kaplan in 1975.

The sitcom ran for four seasons on ABC from 1975-1979.