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Snapped Bonus: Doug Knell Opens Up About Grandfather's Murder (Season 25, Episode 21)

Doug Knell, the grandson of Martin Knell, remembers learning that his grandfather was murdered by his caretaker and close friend, Monica Melissa Patterson. Investigators first believed 96-year-old Martin had died from natural causes, but they later discovered he had been fatally suffocated. Patterson, a former South Texas hospice administrator, was found guilty of capital murder for killing Martin and sentenced to life in prison without the possibility of parole.