Amid rising debts, divorce and substance abuse, Martin Ruddy had his eye on his parents' inheritance and lashed out to get it.

The case of violent alcoholic Philip Middleton, who killed his parents during a drunken argument using a granite block.

The case of 26-year-old Anmol Chana, who was sentenced to a minimum of 36 years after the brutal killings of his parents at their home in Moat Road, Oldbury.

Daniel Dighton, who stabbed his parents to death after they criticised him for his idle behaviour - and then blamed his crime on a hangover.

Indulging himself and his girlfriend in unaffordable luxury, Brian Blackwell killed his parents before another spending spree.

With a thirst for blood and an obsession with knives, Michael Clarke believed it was his destiny to be a killer, and his parents became the victims.

The mysterious disappearance of Jersey couple Nicholas and Elizabeth Newall in 1987, who it turned out had been murdered by their sons for their £1million estate and buried for five years.

After trying to kill his parents in a crash, Stephen Seddon was hailed a hero for saving them. But his evil intentions hadn't gone anywhere.