A teen was gunned down in a botched robbery Monday night in Brooklyn, police sources said.

Aaron Parkinson, 19, was killed when he refused to hand his cellphone over to a thug in East New York at 5:45 p.m., according to sources.

Parkinson and an 18-year-old friend were in a livery cab when the attempted robbery took place.

The friend escaped with just a graze wound to the shoulder.