Gareth Williams (26 September 1978 – c. 16 August 2010) was a Welsh mathematician and employee of GCHQ seconded to the Secret Intelligence Service (SIS or MI6) who was found dead in suspicious circumstances at a Security Service safe house flat in Pimlico, London, on 23 August 2010. His decomposing naked remains were found in a red North Face bag, padlocked from the outside, in the bath of the main bedroom's en-suite bathroom.

http://en.wikipedia.org/wiki/Death_of_Gareth_Williams

Philip Taylor Kramer (July 12, 1952 – February 12, 1995) was a bass guitar player for the rock group Iron Butterfly during the 1970s. After this he obtained a night school degree in aerospace engineering, he worked on the MX missile guidance system for a contractor of the US Department of Defense and later in the computer industry on fractal compression, facial recognition systems, and advanced communications. His disappearance on February 12, 1995 caused a mystery lasting for years.

http://en.wikipedia.org/wiki/Philip_Taylor_Kramer

Oded Schramm died in 2008 on solo climb in Washington State. Really should have won a Fields medal for his work on SLE (Schramm-Loewner evolution), as his collaborator Wendelin Werner received.