UPDATE: 23-Year-Old Woman Found Dead in Tarrytown Townhouse

Police have confirmed Monday night that the Labor Day shooting in a residence of Tarrytown's riverfront Hudson Harbor complex was a fatal one, claiming the life of an 23-year-old woman who did not live in the four-story townhome.

Lt. William Herguth issued a statement live to the press at 9:40 p.m. that offered only scant detail on what may have transpired at 157 West Main Street and who the female victim was. 

Herguth said the department received a 911 call at 4:21 p.m. from that address saying that someone had been shot. He could not reveal if the caller was someone at the scene itself or who may have heard shots nearby.  

Tarrytown police responded along with Sleepy Hollow police and Tarrytown Volunteer Ambulance Corps.

Police arrived to find a woman "mortally wounded and pronounced dead at the scene," Herguth said. He said that she was found in a fourth floor bedroom of a home whose owners' identity he also would not disclose.

Police are not yet ruling this a homicide, he said. He also later said that suicide had not been ruled out either.

"We're interviewing people," he said when asked if there were any suspects.

He also said there were "several weapons" found at the crime scene, which investigators will be examining.

An ABC News camerawoman was in from the city, eager to know if this case had anything to do with Madison Avenue entertainment lawyer Robert Gaulin, who does come up in a quick Internet search as listed at this address. Herguth declined to comment.

Herguth said the investigation would be ongoing -- officials are still parked outside the million-plus dollar home near the end of West Main Street, with most of the area taped off to cars and pedestrians before the cul de sac. They will remain there tonight and "for a while," Herguth said.

Tarrytown detectives are working along on the case -- the first fatal shooting Herguth could recall here since "before 9/11" -- with the Westchester District Attorney, the county Medical Examiner's office and the county police crime scene unit. 

"As more information becomes available and as the investigation continues future updates will be provided," Herguth said from his desk in a press conference that was attended by ABC News 7 and Patch. 

"This is not being classified as a homicide at this point but we're really early on in this investigation and we don't exactly know what happened," Herguth said.