Brother who thought he was poisoned for years stabbed sister with hunting knife as she ate in kitchen, covered body with blanket, and then finished her food: Sheriff

Dwayne Robinson

Main: the outside of the stabbing scene as shown on the local news. Right: suspect Dwayne Robinson looks on during a court appearance (KGW).

Under the apparent belief that his own sister had been poisoning for years on end, a brother grabbed a hunting knife, repeatedly stabbed her in the chest as she ate in the kitchen at home, finished her food confident that it wasn’t tainted, and then admitted to the victim’s ex-husband what he’d done days later, authorities in Washington state allege.

The suspect, 34-year-old Dwayne Breis Robinson, is charged with first-degree murder for his alleged “premeditated intent to cause the death” of his older sister, 36-year-old Diane Robinson, at a home in the Vancouver area where they lived together.

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