A Bronx teen was lured to his death by a 17-year-old teen he befriended on Facebook, police said Saturday.

Ricardo Romero,17, arranged a meeting with the girl in an apartment building on Creston Avenue the Fordham Heights section of the Bronx, police said.

But investigators believe it was a set up — he was ambushed by two men who police believe planned to rob him, sources said.

Romero was stabbed in the chest and head before he ran out of the building and collapsed on East 182nd Street, authorities said.

A passerby spotted a patrol car and cops tried in vain to save his life by administering CPR, police said.

EMS rushed him to St. Barnabas Hospital where he died, authorities said.

Romero lived in nearby Unionport.

The girl was being questioned by police early Saturday, but has not yet been charged with a crime.