For a modern aircraft, the Mitsubishi MU-2 rates right up near the top. Aviation lawyers love them. 755 built, of which 21% have crashed (more than 180 crashes) .. killing over 200 people. If that ain't a widowmaker, I don't know what is.
You'd expect military aircraft to have a high attrition rate, as they are flown to their limits, and often over .. but not a twin t/prop passenger plane.
An MU-2 fell out of the sky here, over the Goldfields of Western Australia, in 1988, and took 10 people with it (no survivors) - the third worst aviation disaster in the State ..
The FAA initiated a major safety inquiry into the MU-2 in Oct 2005, after 11 of them fell out of the sky in an 18 month period.