Double Vic killer sent to hospital

A Melbourne man who gunned down his grandparents at point-blank range has little insight into his crime and will be treated in a psychiatric hospital, a judge has ruled.

Ross Konidaris, 25, was sentenced to a nominal 25-year supervision order at the high-security hospital after he was found not guilty of the double murder by way of mental impairment.

His mental health will be reviewed while in the Thomas Embling Hospital and if doctors deem him fit to live in the community Konidaris can apply to be released.

Victorian Supreme Court Justice Terry Forrest said Konidaris required extensive treatment.

"Mr Konidaris has little insight into his illness and retains delusions as to the necessity of acting as he did," he said on Tuesday.

"He does seem to understand at least that illicit substances impact adversely on his mental health."

Konidaris hid in his grandparents' garden shed before shooting them with a shotgun and setting their Yarraville house ablaze.

He later told police that he believed his grandfather once killed a man, and feared people would come searching for him given their shared surname.

Justice Forrest in February found Konidaris not guilty of murdering Triantafillio Konidaris, 81, and Stavroula Konidaris, 84, by way of mental impairment.

Justice Forrest found Konidaris, a heavy drug user, was suffering from paranoid schizophrenia and was plagued by delusions at the time of the killings.

In the months before the shootings on December 22, 2012, family members reported strange behaviour in Konidaris, including him repeatedly searching beneath his home for explosives.

Konidaris' lawyer Tim Marsh applied for a suppression order on Tuesday, saying his client had been assaulted in Port Phillip Prison after media reports on his crimes.

But Justice Forrest said the public had a critical interest in the final outcome of Konidaris' case and rejected the application.