Metro

Knife madman: ‘Noise’ drove me to slay family

The illegal-immigrant madman charged with massacring his cousin’s wife and four children said he committed the Brooklyn murders because they had tried to move him into a noisy “mahjong spot,” court papers revealed Monday — as the alleged killer was found unfit for trial.

“A few days ago my cousin took me to Flushing to stay there. It’s a mahjong spot,” accused killer Mingdong Chen, 26, told cops, according to court papers.

“I didn’t like staying there because it was too loud. So I argued and took a knife to them.”

Chen told detectives after the Sunset Park quintuple homicide last October that he couldn’t sleep at either the Flushing address or in his cousin’s home.

“When he was in Flushing he was unable to get good rest. In Brooklyn, he couldn’t sleep either so he got a knife and stabbed/cut his cousin’s wife and four kids,” police said in a criminal report — adding that Chen was also depressed about his unemployment and social status.

“This happened tonight because I was thinking about not having a wife and job. My friends are all doing well, I’m in this situation with no wife and no job,” Chen told cops, bizarrely adding, “I thought they were using me to get a green card.”

Chen even complained about the slain Zhuo kids — Linda, 9; Amy, 7; Kevin, 5; and William, 1.

“Her kids tell me to, ‘Do this, do that,’ ” Chen said, but added that he usually had no problems with his cousin’s wife.

The court papers also recount Chen’s description of the order of the murders — beginning with the mom, Qiao Zhen Li, 37, and ending with William.

The madman’s cousin, Yi Lin Zhuo, arrived home after the murders. Neither the cousin, who has returned to China, nor any other relatives appeared in court Monday.

Chen was diagnosed with a specific mental illness, but his attorney declined to say which one.

“The report indicates that the defendant is unfit to proceed,” Brooklyn Supreme Court Judge Vincent Del Giudice said in court.

When questioned by detectives, Chen became angry without warning at one point, standing up and punching a detective in the chest and then trying to kick the detective with his blood-stained foot, according to court papers.

“I reacted in self-defense and punched Chen in the head with my right hand,” one detective wrote in his report.

On Monday, Chen was deemed incompetent to stand trial and will undergo psychiatric treatment until he’s fit for trial. He was formally arraigned, pleaded not guilty and was held without bail.

Chen will make his first appearance before the special psychiatric judge on Feb. 6.