- Went on the trial for the murder of Shorty Shea, was convicted, and sentenced to death. However, on December 23, 1971, a judge changed the sentence to life imprisonment, stating "Grogan was too stupid and too hopped up on drugs to decide anything on his own.".
- During the days when Grogan hung around with the Beach Boy Dennis Wilson, he crashed Wilson's uninsured Ferrari while racing through the roads outside of the Spahn Ranch.
- Grogan was convicted of the 1969 murder of the Spahn Movie Ranch hand Donald "Shorty" Shea and was paroled in 1985.
- Was a member of Charles Manson's "family".
- Has one child, a son named Adam.
- Is a musician in San Francisco, California, USA. (2008)
- Grogan has played alongside notable jazz musicians Rex Hall, Mitch Woods, Dan Hicks, Dave Bell and the Grateful Dead's Bob Weir. He is a master of many stringed instruments including the banjo, dobro, guitarist, and mandolin. He has played in several bands including Mitch Woods and His Rocket 88s, Rhythmtown Jive, The Christmas Jug band and Those Damn Accordians!.
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