Christopher Watts, from Colorado, has admitted killing his pregnant wife.
Newser reports, however, that Watts says he's not the only murderer in the family.
Watts says his wife, Shannon, killed their children to punish him for having an affair.
Watts told investigators that Shannon murdering their children sent him into a rage.
Court papers show that Watts says he strangled his wife because she murdered their children.
The Washington Post reports prosecutors believe he killed them all.