Very difficult to find that information about the deadliest car. I found the Chevy Blazer as the worst. Another site said the Dodge Neon. Couldn't find any official statistics to back it up though.

EDITED:
http://blogs.cars.com/kickingtires/2007/04/iihs_lists_dead.html

Seems like the Acura RSX is the deadliest car, right behind the Chevy Blazer.

Is that what you were looking for?