Now spotlight turning on "accidental" death of father in 2011

A lawyer has shot himself dead just weeks after his mother was found murdered in her bed and 15 months after he witnessed his father's 'accidental' death while they took a hiking trip.

John Conrad Wagner, 32, was found dead in his apartment in Philadelphia as police began homing in on him as a suspect in the shooting death of his mother, Carolyn, in December.

In light of the deaths, questions have been raised about the veracity of Wagner's story that his father slipped while taking photos on a trip to the Mount Rainier National Park in Washington in 2011.