A Secret Service agent struck and killed a woman with their car in Brooklyn this afternoon, law enforcement sources said.

The victim, Maria Tripp, 47 — who lived only four blocks from the scene — was walking along Atlantic Avenue and Ralph Avenue in Bedford-Stuyvesant when she was hit around 4:50 p.m. She was pronounced dead at Brookdale Hospital.

A law enforcement source said the agent had a green light.

“The Secret Service agent is one of our personnel from the New York field office,” said agency spokesman Edwin Donovan.

He added that he believed the agent was on duty, but the accident is under investigation.

“He was not assigned to a security detail,” Donovan said.

In addition to protecting the president and heads of state visiting the US, the Secret Service also investigates crimes, such as counterfeiting.

The NYPD is investigating.