Conversation so far:
When did Whitney Houston die?
Whitney Houston was pronounced dead at 3:55 p.m. on February 11, 2012.
How did Whitney Houston die?
On March 22, 2012, the Los Angeles County Coroner's Office reported that Whitney Houston's death was caused by drowning and the effects of atherosclerotic heart disease and cocaine use.

Question: What else was discovered about her death?
Self-contained rewrite: What else was discovered about Whitney Houston's death, aside from the cause being drowning?