Although there wasn't much physical evidence. An educated juror only needs to trace the evidence that is known. The last time KB was seen was at her own door at 1:23pm. Her apartment is left as she had it on Nov 22 with bread dip recipe ingredients still there. Her blood is in her apartment, her cellphone was the only item of hers that showed activity, and that cellphone was traveling and communicating with PF for several days even though she wasn't seen with PF at his residence during that time. Her child was with PF since Thanksgiving Day. A woman's fractured tooth was found in a burn pit on his property. "No body -no crime".
I think, for me, the most convincing is the cellphone information.
I believe his motive was completely financial. He probably thought she had more money, but turned out she needed his support. He knew eventually she would need to get child support, so he just wanted her gone before it got to that point. I am just glad the baby was placed with the maternal grandparents.
Of course, all speculation on my part.