User blog comment:Ramallah/Mass Effect 3 details revealed/@comment-2127131-20110416163954

I just thought about why Cerberus wants to kill Shepard in both endings.

I Shepard Destroyed the Collector base and told The Illusive man to F off, he now thinks Shepard is an expandable investment and decides to get rid of him.

And if Shepard gave the base to the Illusive man he now thinks that he doesn't need Shepard now because he has the collector base for himself.

just my ideas about why the Illusive man wants to kill Shepard