I also believe that BP is still alive. An that are the clues from Bruno Heller that makes me really sure that Partridge is RJ:
- Bruno said that RJ 'likes the Cold'
BP is a forensic analytic, he is working with dead, cold, bodies
- Episode 1/6 is called ' the dessert rose'
A dessert rose is never really dead, it can grow again and again combined with water.... (Without Water its just sleeping).

Just my two cents.