Stephanie Dzikowski was a young woman, 22, about to start a career as a dental assistant, had a 2 year old baby with Gastroschisis prounounced (gas-troh-skee-sis) I apologize for mispronouncing it in the episode; and a fiance, Sean Sadowniczak. Together they lived with her father, Stephen, in the Port Richmond section of Philadelphia. 
One night, Sean went out for 5-10 minutes to get milk for the baby, came back and Stephanie lay dead, a gunshot to the head, the baby crying.
It would take a year and a half before they found out who killed Stephanie but why? 
The story is a tragic, cautionary tale about never being too careful. Crime comes when one least expects it.