Andrew Breitbart, RIP
Update: Breitbart's father-in-law Orson Bean (via Hot Air) explained what happened:
Breitbart was walking near his home in Brentwood, Calif just after midnight Thursday when he collapsed according to his father-in-law Orson Bean. Someone saw Breitbart fall and called 911. Emergency crews tried to revive him and rushed him to the emergency room at UCLA Medical Center, Bean said.Again, this is simply terrible. My condolences also to his family.
He is survived by his wife Susannah Bean Breitbart, 41, and four children.
Update 2: here's Roger Aronoff's editorial about him on Accuracy in Media, and Mediaite's page of his speech at CPAC (via The Right Scoop). And more from MSNBC, Commentary, and The Jerusalem Post.