How did lil Walter died?

Lil Walter, the influential Chicago blues musician, died on February 15, 1968, at the age of 37. His death was attributed to a heart attack, although some reports suggest it may have been related to complications from drug use and a history of health issues. He was found in a friend's apartment, and his passing marked a significant loss for the blues community. Lil Walter is remembered for his innovative harmonica playing and contributions to the genre.