NEW YORK -- A gunman who killed three people in Greenwich Village Wednesday night was caught on video as he gunned down two volunteer officers, police said.

Video: NYC Shooting Rampage

In the video, narrated by New York City Police Commissioner Raymond Kelly during a press conference, the gunman is seen shooting one of the victims multiple times and then bolting across the street and shooting another victim.

Police said that prior to those killings, the gunman had shot a bartender 15 times before beginning his run through the streets of the trendy neighborhood unaccustomed to such violence.

When it was all over, David Garvin's body lay bloodied and askew outside a shop on Bleecker Street, a gun lying on the sidewalk steps away, according to police.

The 32-year-old had been carrying two semiautomatic firearms and a bag with a fake beard and 100 rounds of ammunition, Mayor Michael Bloomberg said.

A relative said the gunman who killed three people in New York's Greenwich Village had been having problems.

Kelly said the family member revealed David Garvin had shown a spiraling paranoia in recent years and thought people were "out to get him." Garvin -- a former journalist and former Marine -- had no previous psychiatric history.

Police Thursday said Garvin had been repeatedly kicked out of the restaurant where the shooting began and may have been angry that a friend was fired from the establishment.