Out of the Unknown S04E04 - Deathday

Adam Crosse is a reporter for a local paper. A neurotic under-achiever, the last straw comes when he discovers his wife Lydia is having an affair and she coolly tells him she has no intention of either giving up her lover or divorcing Adam. The top crime story of the moment is a serial murderer nicknamed "The Kitchen Killer". Adam sets out to murder his wife and blame it on this shadowy psycho.