PORTLAND – Christian Nielsen is competent to stand trial next month for a bloody rampage in which four people were killed and dismembered over a four-day period last year in western Maine, a judge ruled Thursday.

In a 14-page ruling, Justice Robert Crowley concluded that the 32-year-old cook meets the standard for competency set by the state supreme court. Nielsen’s trial on four counts of murder is set to begin Oct. 10 in Oxford County Superior Court.

Nielsen has entered a plea of not guilty by reason of mental illness. But he signaled last week that his preference would be to plead guilty if he’s ordered to stand trial. Whether he pursues a change of plea remains to be seen.

Defense lawyers contended Nielsen was not competent to stand trial because he’s emotionally detached and incapable of assisting in his defense.

But Assistant Attorney General Andrew Benson insisted that Nielsen has the skills necessary to aid in his defense if he chooses to do so.

In his ruling, issued in Paris, Crowley agreed that Nielsen’s seeming lack of interest is frustrating for his legal team. But the legal standard “is whether a defendant can cooperate, not whether he actually is cooperating,” he wrote.

“While it is certainly unfair to subject a defendant to trial when he lacks the capacity to take part in his own defense, it is not unfair to subject him to trial when he simply chooses not to take part,” the judge concluded.

Nielsen is charged with killing three women at the Black Bear Bed & Breakfast in Newry over Labor Day weekend in 2006. Remains of a fourth victim, an Arkansas man who was a guest at the bed and breakfast, were found miles away near Upton.

Last week, two psychologists agreed with each other on some of their assessments of Nielsen. But they disagreed over whether he has the ability to assist his defense team.

Dr. Ann Leblanc of the state forensic service said he could take a larger role in his defense if chose to do so. Dr. Charles Robinson, a defense psychologist, concluded that Nielsen’s mental illness prevents him from engaging his lawyers.

To be found competent, Nielsen must understand the charges against him, understand his own situation and have the ability to cooperate with his defense lawyers in a “rational and reasonable way,” Benson said in court.

“It is a fairly straightforward ruling,” Benson said Thursday. “The judge looked at the standard set by the [state supreme court] … and simply concluded that the overwhelming weight of the evidence was that Christian Nielsen has the skills of competence.”

Nielsen’s lawyer, Ron Hoffman, said he’ll try to get Nielsen to talk about the case, but that so far his client won’t discuss what he was thinking at the time of the murders.

“If I can’t get him to talk about he plea, I’m left with no choice but to go to trial,” Hoffman told WCSH-TV.

The finding that Nielsen is competent to stand trial doesn’t prevent Nielsen from pursuing an insanity defense if the case goes to trial as scheduled.

Though Leblanc said Nielsen meets the legal definition of competency, she acknowledged that “he’s not a mentally healthy person at all.”

Both Leblanc and Robinson testified that Nielsen suffers from schizoid personality disorder. Robinson also said it’s likely that Nielsen suffers from other mental problems including Asperger’s Syndrome, a mild form of autism.

Authorities say the slayings centered on the Black Bear Bed & Breakfast, where Nielsen was a long-term guest while working nearby as a cook.

The first victim was James Whitehurst, 50, of Batesville, Ark., a handyman who had been staying at the B&B and helping out the owner, police said. Authorities said Nielsen burned and disposed of Whitehurst’s body in the woods in Upton.

Two days later, he allegedly killed the Black Bear’s owner, Julie Bullard, 65. The following day, Labor Day, he allegedly killed Bullard’s daughter, Selby, 30, and her friend, Cindy Beatson, 43, when they arrived at the inn unexpectedly.