They did it in the end. Kovac apparently met the deceased person in prison and learnt where he grew up, and where he grew up, there was a location Kovac could hide after he got out of prison, so Kovac exploited the guy to get out and hide, and then he killed the guy. Kovac then went back home to find it destroyed. Bones ended on a very sad note but with a bit of a twist at the end. The whole thing was probably not meant to be resolved like this but since they didn't want to give too much away before the new season starts on October 30th, they decided to leave things open-ended.