Yes, I saw this a while ago. It is a bizarre and powerful documentary, during the course if the film you sway many times from thinking the father is innocent to guilty.
A similarly powerful documentary is Paradise Lost- The Child Murders At Robin Hood Hills. Although this is slightly different in that the young men accused seem to be innocent, based on all evidence, but seem to have been found guilty primarily on the basis that one is a goth. It's quite frightening and frustrating, but also compelling to watch
