A female corrections officer is in police custody following two fatal shootings - one at a Long Island hospital and another at a nearby residence - early Wednesday morning.

Police say they arrested Kim Wolfe, 43, at about 5:45 a.m. after she surrendered to Nassau County and Hempstead Village cops, who located her beige Mitsubishi Montero on Harriet Avenue in Hempstead. Officers surrounded her SUV after pulling her over. They say she had the murder weapon, possibly her service firearm, sitting on her lap when she surrendered.

The location is about a half-mile from where Wolfe took her 23-year-old niece hostage. Police recovered the young woman from the vehicle unharmed and in good condition.

Wolfe is a law enforcement officer at the Nassau County Correctional Center, or county jail, in East Meadow. Its campus is adjacent to Nassau University Medical Center (NUMC), where Wolfe shot her first victim at around 1 a.m.

Police say Wolfe was on her day off from work at the county jail when she went to NUMC and confronted 45-year-old Stacie Williams, a maternity ward patient care assistant. Wolfe shot Williams multiple times on the sidewalk in front of the center's west entrance.

A hospital security guard making routine rounds found Williams lying on the ground. He initially thought she was in cardiac arrest but soon realized Williams had been shot multiple times. Nassau County Detective Lieutenant Kevin Smith told WPIX, "The suspect knew all of her victims. This appears to be some sort of domestic dispute."

Williams, a Hempstead resident who was working the night shift, was rushed to the emergency room. She was pronounced dead at 2:05 a.m.

At about 1:30 a.m., Wolfe drove about 2.5 miles to a relative's home located on 56 Vermont Avenue in Hempstead.

There, she fatally shot her 56-year-old uncle multiple times, and shot her elderly grandfather in the leg. Wolfe then threatened family members and kidnapped a 23-year-old niece at gunpoint.

The grandfather is said to be in good condition and recovering from his injury at Winthrop University Hospital in Mineola.

After police took Wolfe to police headquarters, she requested to go to a hospital for treatment. Officers granted her request, and she spent the rest of Wednesday morning at an area health care facility. The 20-year veteran corrections officer is also expected to be arraigned for the crimes at bedside, out of the view of television cameras.

Police said late Wednesday morning that the son of Stacie Williams, Wolfe's alleged first victim, may have gotten hit by a car while crossing Hempstead Turnpike, a busy four-lane road in front of NUMC, on his way to see his mother shortly after medics rushed her into the emergency room. They said he broke both of his legs in the incident and may have been treated in the same emergency room where his mother died minutes earlier.

In the more than four hours between the discovery of the first shooting and Wolfe's arrest, Nassau County Police issued a "be on the lookout" alert for the five New York City boroughs and northern New Jersey police departments for the woman they described as armed and dangerous.

The motive for the shootings and kidnapping are unclear, and the investigation is ongoing.