Maybe I've been watching too many Sopronos episodes...but I really have doubt that Condit (and associate) did the act. I think Chandra was going to meet at the park and Condit knew it was serious business and she needed to be taken out of the picture...thus some mafia connection of Condit's was supposed to be there to accomplish it. But somewhere in the park....the park rapist (unrelated to Condit) met up with Chandra and she attempted to escape...and falls down a hill...breaking her neck. The mafia guy never accomplished his hit...Condit got worried about the whole thing...where did she go? So he runs over to her apartment and checks out the whole place that night....and is completely puzzled by the disappearance of Chandra and thinks she already left town. Thus Condit is truely innocent...(only in the mind of course).
I don't think Condit killed her either
I think the guy who is in jail for committing very similar rapes and robberies in the same park killed her
But, of course , he still wanted to cover-up their relationship and some other things in his private life such as the alleged sex parties, to protect his career