Startling video released by police shows the moment a corrections officer is gunned down while sitting in her car in Brooklyn Sunday night.

Alastasia Bryan, 25, was fatally shot by an individual who is seen walking up to her vehicle and firing several rounds through the window.

The suspect then jumped into a dark-colored Honda Civic and sped away.

The off-duty rookie officer was parked at Avenue L and East 73rd Street in Flatlands around 9:15 p.m. when the shooting occurred. Bryan was struck in the head and torso, killing her instantly.

Bryan, a recent academy graduate, was in the neighborhood visiting friends and family, before heading to work a shift at Rikers Island.

Her murder appeared to have been planned, with her killer lying in wait, according to police sources.

Photos of the two suspects and getaway vehicle involved in the crime were also released.

Cops have been looking into an ex-boyfriend with a lengthy rap sheet as a potential person of interest.

NYPD Chief of Detectives Robert Boyce said Monday, “We’ve got a long way to go in this investigation.”