In fact, there are at least 3 unanswered questions:
1) Like what Einfield said, "Was the letter written by Teh himself?"
2) The last person with Teh on the night before he killed himself, was Lee Kuan Yew - the question is, has Lee Kuan Yew anthing to do with his death?
3) How did he obtain the bottle of sleeping pills? Did some one give it to him the night before, or how did Teh obtain them?
These are all valid questions, as well, in conjunction with these questions, there should be a CPIB or CAD corresponding investigation. Where did these millions in the accounts of the Teh family com from? Also, did the coroner interview LKY, as he was one of the last few people to talk to teh. Who is the Dr. that precribed the medication, and why?
In my opinion, Teh (if he really did kill himself), should not have done so. he should have demanded a trial and than proceed to bring out all the PAP skeletons in the closet. I am sure the money trial goes to other PAP elites and not just him. He had the power to bring down the PAP. The oppo should have gone to him at the time and pursuade him to go to trail. Probably, LKY threatened repurcussions on his family unless he took the easy way out.