An "evil" father sedated his two young children with chloroform and Temazepam before gassing them in his car, an inquest has been told.
Karate expert Brian Philcox, 53, killed Amy, seven, and three-year-old Owen during an access day from his estranged wife in an isolated lane in Llanrwst, North Wales, last June. He also killed himself.
Philcox, who was going through a bitter divorce from Evelyn McAuliffe, 38, sealed his Land Rover's windows with duct tape after attaching a pipe from the exhaust and sat beside the youngsters as they inhaled the fatal carbon monoxide.
An inquest at Llandudno Magistrates' Court recorded verdicts of suicide and unlawful killings over the deaths.
Ms McAuliffe said she would never forgive Philcox, whom she married in 2000.
She said: "He had no right to take their lives. He was an evil man whose attempts to use home-made bombs clearly show that all his acts were that of a cold-blooded, premeditated killer."
Llandudno Magistrates' Court was told Ms McAuliffe had begun divorce proceedings against Philcox by June 13 last year when he took the children during an access day away. He knew we would be unable to see them on Father's Day - the following day - and hatched a plan to kill them.
Philcox drugged the children with chloroform from a padded envelope and attached a vacuum cleaner pipe to the exhaust of his Land Rover in an isolated spot near Llanrwst in North Wales. The trio were found dead, poisoned by carbon monoxide fumes, sitting next to each other on the back seat of Philcox's car.
Offering his condolences, the coroner told Ms McAuliffe: "When Brian Philcox took Amy and Owen from you he thought they would be lost to you forever - but he failed.
"The short lives they had were imprinted on your heart and they will endure with you. They will be part of you every single moment of every single day."
