If you think there have never been murders committed in the name of power and political ambition, you are naive. They just have many people at their fingertips to "make things happen."
There is nothing now to prove Condit is involved, but there also is nothing to prove he wasn't. I'm just not a big believer in coincidences.
ETA: Yes I am reading the series. Nothing I've read so far changes my mind.
There isn't any evidence that Condit had a motive to kill her since ALL of the available evidence of what she told her friends and family was that she was in love with him and expected him to eventually marry her. Whether this is true or not, the evidence shows that this is what SHE BELIEVED within 48 hours of her disappearance. There are no computer records, letters, emails, diary entries, nothing that supports the idea that Condit would have any reason to need to get rid of her. The pregnancy idea, also completely unsupported by fact, its fiction, pure speculation.
WHY then when she's about to leave DC and he can let her down over time would he kill her, it makes no sense.
Her death in and of itself made it likely that his affair with her would come out. IF he had wanted to kill her he would have made it look like a suicide or a failed robbery...hit over the head, wallet stolen, body found ASAP.
If you want to hide an affair then you make sure the death is easily and quickly explained.