S.I. triple killer deemed insane

SON OF SAL is officially insane.

The trial of accused serial killer Salvatore Perrone was put on indefinite hold Friday after a psychiatrist found him to be unfit for trial.

The conclusion came after the Staten Island loner — charged with killing three Brooklyn shopkeepers in 2012 — had spent the past two years acting as his own lawyer while displaying erratic behavior.

A mental exam found that Perrone’s “ambivalence towards defense assistance, his paranoia regarding court personnel and his rigid, repetitive manner of thinking all point to the presence of a psychiatric disorder,” said Brooklyn Supreme Court Justice Alan Marrus.

The shrink found a “diagnosis of either delusional disorder or a paranoid personality disorder.”

The 65-year-old defendant, whose trial was planned for early next year, will now be under around-the-clock observation at a state psych ward to further assess his condition.

Frustrated family members of the victims left the courtroom shaking their heads.

“From the beginning, he basically used every reason to get attention, to play the game, to get off the hook,” said Rabbi Uziel Admoni, speaking on behalf of relatives of the second shooting victim, Isaac Kadare.

Perrone, dubbed “Son of Sal” by his neighbors, was not present in court. The apparel salesman is charged with using a shotgun to kill Middle Eastern merchants on three different occasions over a five-month period.

Howard Kirsch, who served as his legal adviser even though the defendant refused to see him, was appointed his lawyer in light of the mental diagnosis.

“He’s impossible to talk to,” the lawyer said outside court. “The psychiatrist thinks he’s a lunatic -

that’s my technical term.”