NEW YORK (CBSNewYork/AP) — A 24-year-old man who admitted to stabbing his stepfather and two others to death in a rampage across the city will be sentenced next week.

Maksim Gelman pleaded guilty to murder and other charges in a February 2011 spree that included fatally running down a pedestrian, carjacking and attacking a subway rider.

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His sentencing had been scheduled for Wednesday but was postponed to Jan. 18. No plea deal was offered.

Gelman said he wanted to get out of his holding cell and start serving his time in a permanent facility. He says the change in plea came after psychiatrist recently said that Gelman couldn’t argue he was not guilty by reason of insanity.

Gelman was arrested on Feb. 12 after a deadly stabbing spree which started with a family argument over the use of his mother’s car, police said.

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After killing his stepfather, Aleksandr Kuznetsov, 54, in the family’s Brooklyn apartment, police said Gelman went to the home of a female acquaintance, Yelena Bulchenko, 20, where he killed her 56-year-old mother.

Police said he waited hours for Bulchenko to return and then stabbed her 11 times.

Gelman then stabbed a man during a carjacking before plowing into pedestrian Stephen Tanenbaum, 62, who died from his injuries. Authorities said he then attacked a livery cab driver and another man in a separate carjacking.

He was subdued by police at the Times Square subway station after slashing subway passenger Joseph Lozito, of Philadelphia.

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