Conversation so far:
When did Bobby Sheehan die?
On August 20, 1999
How'd Bobby Sheehan die on August 20, 1999?
an accidental drug overdose

Question: Who did the band replace him with?
Self-contained rewrite: Who did the band Blues Traveler replace bobby Sheehan with after he died on August 20, 1999 of an accidental drug overdose?