Did Alcoholism Kill Joan Didion's Daughter?

Readers of Didion's recent memoir of grieving her daughter, Blue Nights, may be forgiven for remaining somewhat unclear, even upon finishing the book, as to what exactly killed Quintana Roo Dunne Michaels. Quintana, whom Didion often calls Q, was in 2005 a recently married New York-based photo editor in apparent good… » 12/13/11 6:00pm 12/13/11 6:00pm