Wanjiru's death doesn't look like Suicide. Jumping from a second floor Balcony and cracking a skull, sounds far fetched unless he was too drunk. And if he was too drunk he couldn't have possibly jumped-too drunk to jump. And if he did, it could have been in a slow motion, that means someone could have been able to save him
Probable situation;
Case 1: Wanjiru got home drunk and had a commotion with the wife and a fight ensue. In the pushing and shoving he gets pushed over the balcony!
Case 2: Wanjiru got home drunk with a hooker, the wife get pissed off and a fight ensued. In the pushing and shoving, wanjiru get tipped over the balcony.
Note:
Wanjiru threatened to kill his wife before, and the wife asked for a divorce and a share of the wealth in the aftermath. Then surprisingly, they reconciled during the Valentine's day this year. Mind you he also threatened his watchman in the same ocassion, and now the main witnesses of his tragic death are his wife and the watchman. Can you smell something here?
Just a mere speculation!
Let's wait and see!