Police arrested the boy who allegedly fatally stabbed another teen over the weekend in the Bronx, authorities said Monday.

Mohammed Fadika, 16, was busted in the murder of Alijay Morgan, who was discovered Saturday evening clinging to life on the sidewalk near West 181st Street and Grand Avenue in University Heights, only blocks from his Morris Avenue home, police said.

The teens were arguing when Fadika stabbed his 16-year-old victim twice in the torso, police said.

The pair had previously clashed, though police could not say over what.

Fadika was nabbed at his Grand Concourse home Sunday around 10:30 p.m. He was charged with murder, manslaughter and criminal possession of a weapon, police said.

He is expected to be arraigned in Bronx court Monday.