NYDNA BROOKLYN carpenter confessed to killing his roommate, chopping up his body and storing parts of him in his refrigerator — all because the victim was too loud, police sources said. Sergey Mamontov, 50, told cops he killed his roommate, Aleksandr Zilbergleyt, 55, after a fight erupted in their Sheepshead Bay home on March 25, the sources said. “He was very matter of fact,” the source said. “He didn’t want to say anything at first, but once he started talking, he wouldn’t shut up. He said he decided there was no other way to take care of (the victim).” Cops raided the home Tuesday and found Mamontov, a Russian immigrant, in the living room watching TV. Police opened the fridge and found dismembered remains of the victim — a mix of bone and tissue — in at least a dozen containers of bleach. Mamontov also told detectives he cut off his roomie’s fingers and tossed them into Sheepshead Bay, a source said. “He was very meticulous, very methodical,” one of the sources said. “He cleaned up afterward. He put the body parts in the refrigerator . . . He didn’t know what his next move was.” “He said his roommate was noisy, that he brought in friends, including homeless guys, and other inappropriate friends,” another source said. “They kept him up at night.”

If you’re Sergey Mamontov and you’re a 50 year old man living with 55 year old Aleksandr Zilbergleyet, I’m pretty sure you gotta take the bad with the good. Like you gotta be thinking to yourself – what sort of 55 year old man needs a roommate? Chances are hes the type who brings over homeless friends at night. Thats a surefire way to be 55 and alone. I don’t think its fair to sign a lease with a middle aged Russian Immigrant and expect that he respects quiet hours and keeps to himself.

By the same token if you’re Aleksandr you gotta at least be aware that you’re also living with a middle aged Russian immigrant and there’s a strong chance if you keep bringing homeless people over the crib, you’re gonna end up getting Dexter’d and your body parts are gonna be soaking in tupperwares of bleach. It really just comes down to roommate respect. Just like any other apartment in New York City. I know that if I keep my roommate up when he’s gotta be up early for work, he’s gonna passive aggressively say something to my third roommate. Aleksandr Zilbergleyet has gotta know if he keeps up Sergey that he’s getting dismembered and put in the freezer.