What did Najib know and when did he know it?

In Malaysia’s sensational and politically explosive case of the murder of Altantuya Shaariibuu, a Mongolian translator and jilted lover, the trial of three defendants so far has been remarkable for the man who isn’t there: the most obvious potential suspect and witness. That is Najib Tun Razak, the deputy prime minister and former defense minister. As s…