Huge coincidence or just bad writing??? (SPOILER)
Did Angel (Forest W. character) suspect or know the life coach (Tommy) had any part in his mother's death before Tommy admitted to driving the car and the brother Ben admitted to dumping the body in the final scenes?
If yes, why didn't it come out sooner in the story? Unless I missed it somewhere, the story unfolded as if Tommy didn't know he'd actually hit a pedestrian and certainly didn't know it was Angel's mother until Ben told the story. When Angel was beating him into confessing prior bad acts you think Tommy would offer up that event rather than divulge strangling a cat when he was a kid and if Angel knew or suspected Tommy's role in his mother's death he would keep pushing him to admit it.
If not, it is a huge (and very improbable) coincidence that Angel would abduct and torture a person almost at random that turned out to be involved in his mother's death.