NYPD Officer Shot Dead

A police officer has died after he was shot in the head while chasing a robbery suspect in New York City, authorities said.

Randolph Holder was shot Tuesday night while responding to reports of a gunman in East Harlem, Police Commissioner William J. Bratton said.

He died a few hours later -- making him the fourth officer killed in New York City in 11 months, according to Bratton.

The incident started following a report of armed robbery.

"Responding officers were told by a victim that his bike had been stolen at gunpoint," Bratton said.

Holder, 33, and his partner were in plainclothes when they saw a suspect riding a bike on a pedestrian overpass.

The pair, part of a unit that works in the New York City housing developments, exchanged gunfire with "suspects."