A coldblooded ex-con wanted for murder was nabbed in Brooklyn after more than 20 years on the run, The Post has learned.

José Sean Pellet, 46, who was being sought for a 1991 execution-style murder of a man in Baltimore, was busted by FBI agents near his East Flatbush home Tuesday, authorities said.

“He was caught as he attempted to flee into a subway station,” said FBI spokesman Peter Donald.

The fugitive had been living with a girlfriend in an apartment three blocks from the take-down spot.

Pellet, once known as Sean Gumbs, was convicted of manslaughter in the 1983 shooting death of his then-girlfriend in Brooklyn, records show. He spent four years behind bars, from 1984 to 1988, before being sprung.

Pellet had been using various aliases while on the lam, officials added.