LOS ANGELES — Dallas Taylor liked to say that he made his first million – and his last million – by the time he was 21.

The rock drummer was a key sideman for Crosby, Stills, Nash & Young. He played at Woodstock, appeared on seven top-selling albums and bought three Ferraris. He also stabbed himself in the stomach with a butcher knife and drank so heavily that he required a liver transplant in 1990, five years after becoming sober.

Taylor, who went on to become an addiction counselor specializing in interventions and in reuniting alcoholics and addicts with their families, died Sunday in a Los Angeles hospital. He was 66.

He had been in failing health for some time, said his wife, Patti McGovern-Taylor.

McGovern-Taylor gave her ailing husband one of her kidneys in 2007.

Taylor’s health forced him to largely exit the music business after his liver transplant. But he continued to treat musicians and other celebrities with addiction problems.

Dallas Woodrow Taylor Jr. was born in Denver on April 7, 1948, and raised in San Antonio. He was the son of a stunt pilot. When he was about 10, he saw the “The Gene Krupa Story,” a screen biography of the jazz drummer, and his course in life was set. He dropped out of high school at 16 and headed for Hollywood, where he tasted success with the rock band Clear Light.

In the late 1960s, Taylor met David Crosby, Stephen Stills and Graham Nash, joining them on their first album, “Crosby, Stills and Nash.” But Taylor’s drug habit stood out, and he was fired by the group in the 1970s. After he became sober, he acquired a credential in treating addictions, first working with troubled adolescents, his wife said. “He saved a lot of lives and his own in the process,” she said.