https://faroutmagazine.co.uk/10-great-songs-dropped-from-grateful-dead-live-shows/?amp=

“With Pigpen’s death came a permanent abandonment of ‘Mr. Charlie’. There were rumours that Pigpen was potentially going to work on a solo album in his later years and ‘Mr. Charlie’ would have made a great addition. Garcia lamented the fact that the band never recorded the song in 1993, saying: “I thought ‘Mr Charlie’ was a great tune. I’m sorry we never got a chance to do that one in the studio.” Tyler Goslin