The case of Eric Locke, who resorted to threats when Sonia Blount ended their relationship before creating a fake profile and killing the mother of one in a hotel room.

A supposed violent break-in which left Catherine Nevin's husband dead, was initially seen as a robbery gone wrong, until police dug deeper.

In 2005, Farah Swaleh Noor's body parts were found in a Dublin canal. Soon, his partner and her daughters came under the microscope.

New & Exclusive. Colin Whelan: When Mary Gough was found dead in 2001, her husband appeared shocked before his web of lies and deeply sinister intentions were brought to light.

In 2004, Joe O'Reilly murdered his wife and made it look like a burglary gone wrong. Before being caught, he even appealed for information on TV.