The 1981 shooting death of Paul Witte, a father of two in Indiana, seemed to be an accident: Paul's 15-year-old son Eric said he'd tripped while holding the gun, fatally wounding his dad as he napped on the living room couch. The case was considered closed -- until a few years later when a second accident befell the Witte family. This time, police dug deeper and found that Paul's wife, Hilma Marie Witte, had been the mastermind of two horrific tragedies.