John Jefferson
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.
The Clark County Sheriff’s Office has alleged that the defendant admitted stabbing the victim on Sept. 15, a Sunday, and then living with the body for days — before his sister’s ex-husband, worried about not hearing from her, stopped by the residence the Wednesday that followed, knocked on the door, and learned the horrifying reality of her violent death from the suspect’s own mouth, local NBC affiliate KGW reported.
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The ex-husband, identified in reports as Kenneth Leachman, responded to Robinson’s alleged admission by calling authorities that day. When deputies got to the stabbing the scene, they reportedly found the victim dead in the kitchen of the residence and under a blanket that the defendant allegedly placed over her body intentionally.
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What led to the stabbing? Dwayne Robinson allegedly expressed that he was depressed and upset by the belief the victim had engaged in a years-long campaign to poison him, but his defense attorney’s request for a competency hearing suggests that belief was unfounded.
Chillingly, the defendant allegedly told authorities that he stabbed his sister multiple times while she was eating something in the kitchen at home, only to cover her with the blanket and finish her food because, in his mind, he knew “it wasn’t poisoned,” the Oregonian reported.
Jail records reviewed by Law&Crime show that Robinson was booked one week ago and remains behind bars in Clark County without bond in the first-degree murder case as he awaits a court date on Oct. 9.
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