A Bronx charter school science teacher was arrested Friday after allegedly brutally beating a 16-year-old student whom he said owed him $4,000 in drug money.

The teen was taken to a local hospital with a cut on the back of his head so large that it required stitches, according to DNAInfo.

John V. Lindsay Wildcat Academy teacher Kevin Pope, 48, allegedly threatened to have the student’s mother raped “every day after work” during the beating, according to New York Daily News.

“Do you want to die?” Pope allegedly shouted. “You want to steal from me? I should break your arm.”

“You know where I work,” he reportedly added. “You better get my money or I will kill you!”

Citing police sources, the Daily News reports that the two’s relationship allegedly began three months ago, when the teen is said to have told the teacher he had a drug connection in Manhattan.

Pope reportedly agreed to pay $4,000 for a pound of marijuana, but the transaction fell apart when the dealer demanded $7,000.

The teen reportedly never returned Pope’s $4,000, prompting the altercation, sources told the paper. Pope allegedly approached him on the street and assaulted him, in view of a witness and surveillance camera.

He also allegedly walked off with the teen’s iPhone, wallet and gold chain, police said.

Pope faces charges of assault, grand larceny, criminal possession of stolen property and robbery.