20/20 has the first television interview with Angelika Graswald, convicted of involuntarily killing her fiance while kayaking on the Hudson River, after being released from prison.

An inmate's dad makes a plea to save his son from execution and explains how he's forgiven his son for hiring a hit man to murder his own family.

Tonight 20/20 examines the mysterious death of a woman - ruled a suicide by police - in the midst of the wrongful death civil trial against her boyfriend's brother.