Baby in car
Strange that he had been looking on the net about baby's dying in cars and the heat that would killl him! a lot like how a wife/husband researching on the net on how to kill the partner making it appear an accident.
There's other evidence of his guilt as well. like belonging to a group that did not want kids in their relationships..
Do not get between a wombat and a chocolate biscuit; you will regret it dearly!