A veteran firefighter and father was shot and killed in a case that quickly became more complex than it first appeared. In a new 20/20, johnquinones sits down with the victim's sister-in-law Mandy Fillmore, who describes the heartbreaking discoveries that came out of the investigation and the conflicting emotions she still carries. Stream #ABC2020's newest episode "One Last Call" - now available on DisneyPlus and Hulu.