Police found bones, a rib cage, and other body parts stored in vats of bleach and acid in the Sheepshead Bay apartment where Sergey Mamontov allegedly killed his 55-year-old roommate on the night of March 25. The two men had lived together for six months, but reportedly did not get along.
When Mamontov came home on March 25 and found the victim drinking with two friends, he flew into a rage. He kicked out the two visitors and a vicious fistfight ensued.
16-year-old Alan Lazebnik, who lives downstairs from the fourth-floor apartment told the Post that he and his mother heard banging and screaming on the night that the unnamed victim disappeared. “Me and my mom heard something really hard fall and I heard screaming. It was quick. I heard screaming, but it scared me,” he said, “I was going to go tell the super, but since it stopped so quick, I figured I would just tell him next time I saw him.”
After purportedly killing his roommate, Mamontov attempted to dispose of the body by chopping it up and dissolving the remains in a solution of Clorox bleach and acid. Police found a grisly scene when they arrived, a refrigerator stuffed with plastic containers of toxic chemicals and decaying flesh, bones and rotting offal in boxes and bags.
Officers were responding to a complaint by a friend of the deceased, who had gone to the apartment to investigate after not hearing from his friend in several days. Mamontov told the man, “You’re not going to see him anymore. He’s not around anymore. I cut him up.”
Mamontov has had prior run-ins with the law, two DUI convictions and one for grand larceny. A female neighbor described the Russian immigrant as “creepy,” and described his recent attempt to invite her to the apartment, saying, “Come up to 4D. The party’s in 4D.”
Mamontov confessed to the killing when police arrived at the apartment around 1 p.m. Tuesday. Police investigators have collected all available evidence from the apartment and all trash from the building in hopes of locating and identifying as much of the victim’s remains as possible so that they can be forwarded to the Medical Examiner’s Office.