An engaged couple wanders the open road -- but only one returns home.

A mom uses sex, deception and the Internet against her husband and lover.

An engaged woman and her mother are murdered; the killer's letters taunt police.

A look into the case of Lori Vallow just after a guilty verdict in her trial for conspiring to murder her fourth husband.

A bride-to-be and her mother are murdered just weeks before the wedding. The investigation leads police to a bizarre trail of clues, including taunting letters from the killer.

A teacher's murder reveals an affair and a secret pregnancy.

A bride is murdered 48 hours before the wedding; police uncover a double life.

A husband is praised for killing his wife's alleged murderer until three photos help unmask a killer.

A young bride-to-be is found murdered on her kitchen floor with a single gunshot wound to her head.