A Brooklyn carpenter has confessed to killing and chopping up his roommate because he was too loud. Cops raided Sergey Mamontov’s Sheepshead Bay apartment after getting a tip that his roommate was missing. Click below to read the rest of the story.

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Police went to the men’s fourth-floor apartment and found Mamontov, 50, at home watching TV in the living room with the dismembered remains of the victim mixed with bleach in the fridge, the sources said.

“He was very meticulous, very methodical,” a source said. “He cleaned up afterwards. He put the body parts in the refrigerator … He didn’t know what his next move was. He didn’t know where he was going to take the body parts.”

Mamontov confessed to the killing, 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\].”

The source said the 55-year-old roommate, whose name was not immediately released, had been living in the apartment for about eight months. During that time, there have been several 911 calls by both men complaining about each other, the source said.

Mamontov apparently got angry when he came home one night last week and found his roommate partying with a group of pals, sources said.

The next morning, Mamontov called 911 and demanded police give his roomie the boot. But cops couldn’t toss the man, because he lived there.

“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.”

The suspect was being questioned at the 61st Precinct stationhouse Wednesday and police expected to charge him with murder.

Cops searched the building on Nostrand Ave., including the garbage and the garage, looking for evidence.

A neighbor who lives on the fourth floor near Mamontov’s apartment said the suspect had several different roommates in the last couple of years. She said she often heard partying in Mamontov’s home and said he recently made a chilling statement about his most recent roommate.

“Maybe two weeks ago I saw Sergey and I asked him, ‘You have another roommate?’” said Eugene Lisoukova, 66. “He said, ‘Yes, but he will go away soon and no one will see him anymore.'”

A teen who lives with his mom in the unit directly below Mamontov said he heard a loud crashing sound and commotion from the apartment early Sunday, March 25, the date the victim apparently disappeared.

“Someone fell really hard and someone was screaming,” said Alan Lazebnik, 16.

Lisoukova and other neighbors who knew Mamontov said they were shocked to hear the allegations against him and that their encounters with him were pleasant.

One couple who live next door defended Mamontov, saying the victim was “bad.”

DN