Dick Kniss played stand-up bass behind Peter, Paul and Mary for more than 40 years.
Dick Kniss cause of death
Kick Kniss died of chronic obstructive pulmonary disease (COPD).
Dick Kniss was 74 years old at the time of his death.
Peter Paul & Mary - Puff the Magic Dragon
You can see Kick Kniss (I assume) standing on the side in dark.