PORT ANGELES — An arraignment of a man accused of trying to kill his stepuncle with a potentially deadly dose of insulin has been postponed so he can receive a brain test.

Robbie Wayne Davis, 39, was charged June 30 with first-degree attempted premeditated murder and first-degree assault of 57-year-old Richard Haynes.

Aggravated circumstances were added to both charges.

On Friday, Clallam County Superior Court Judge George L. Wood reset Davis’ arraignment for next Friday at 1:30 p.m.

Haynes was being treated for an unrelated ailment at Olympic Medical Center on June 15 when a nurse discovered him with dangerously low blood sugar shortly after being visited by Davis.

Port Angeles police alleged that Davis injected Haynes, who is not diabetic, with insulin.

The results of a mental evaluation on Davis are pending.

Serious injuries

Defense attorney John Hayden on Friday told Wood his client sustained “serious injuries” in the past that warrant an electroencephalogram, or EEG.

An EEG records brain activity. It can be administered in jail, Hayden said.

“It’s a pretty simple thing to do, but it could give us just a wealth of information,” Hayden said.

County Deputy Prosecuting Attorney Jesse Espinoza did not object to the second continuance in as many weeks.

Davis was evaluated by Dr. Ken Muscatel after Hayden raised the issue of his client’s mental competency.

Davis has maintained his innocence. He is being held in the Clallam County jail on $25,000 bail.

Court papers said Haynes was also hospitalized last December for dangerously low blood sugar and was admitted to OMC in March with abnormally low blood sugar “confirmatory of injected insulin,” according to the police report.

A sheriff’s detective in April “developed probable cause to believe that somebody in the household had administered insulin to Haynes; however, there was insufficient evidence to develop probable cause to show that any one person was responsible for injecting Haynes with insulin,” the report said.

Davis lives east of Port Angeles with Haynes and other family members, one of whom is an insulin-dependent diabetic, so needles and insulin are in the home, police have said.

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Reporter Rob Ollikainen can be reached at 360-452-2345, ext. 5072, or at rollikainen@peninsuladailynews.com.