A suspect was arrested for allegedly killing a man after a fight broke out at a Lower East Side barbershop, cops said.

Charles Fernandez, 29, was fatally shot after getting into a fight inside Jose Beauty Salon and Barber Shop on Forsyth Street around 9:30 p.m. on Oct. 6.

Joshua Nunez, 21, was arrested today and charged with murder and weapons possession, cops said.

Nunez, who lives in Bushwick, Brooklyn, has prior arrests for reckless endangerment, drug-impaired driving, criminal mischief and disorderly conduct, police sources said.