Steve Bridges...the Obama impersonator, who unexpectedly died within a week of Andrew Breitbart...who also died "unexpectedly".
Bridges (who also was renowned for his George W. Bush impersonation) died of anaphylaxis, described medically as "a serious allergic reaction that is rapid in onset and may cause death. It typically causes more than one of the following: an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, and low blood pressure. These symptoms typically come on over minutes to hours."
Breitbart died of a heart attack. (He may have suffered one previous one.)
And both can happen unexpectedly.