Imperfect Murder

David and Tonya Ford lived what appeared to be a normal life, until David was found shot in their home, with investigations uncovering strains in their marriage. (S4, ep 1)

When 21-year-old Reagan Tokes was abducted, sexually assaulted and murdered in Ohio, Brian Golsby was quickly apprehended, before new legislations were then passed. (S4, ep 2)

When Ben Oxley was murdered in 2008, his ex-wife's involvement became a key development in the case - even being granted immunity despite her role in the killing. (S4, ep 3)