With regards to the David case...
I've been reading through a few websites (including the original straits time articles) 'cos there have been quite an amount of speculation as to whether he really committed suicide, as well as contradictions between the information given and information found out later (e.g. no wounds on wrist). So now there's a small hoo-haa going on.. the 2nd death case found in ntu didn't help either. lol.
here are two websites which summarized the speculations...
http://leapon.net/en/curious-case-david-widjaja
http://justlimz.blogspot.com/2009/03/david-case-high-profile-crime-not.html

interesting.