A Penn Dad plays the hero in an inferno he ignited almost killing his wife & kids. The savior act was shattered cops say after chilling & incriminating "If I can't have her, no one will" notes were found, in a cabinet. 

Three children are left orphaned by evil after their father guns down their mom & grandparents -- then turns the weapon on himself. Plus, a deranged attacker is no match for an MMA-trained military recruit! Jennifer Gould reports.