Searchers fanned out in the park on Thursday after some of Monroe's belongings including ID was found in a heavily wooded area Wednesday night.
Monroe left her home in Yonkers in the early morning hours of July 7th. Surveillance video shows the 65-year old sitting on a bench outside of a pizza shop on Warburton Avenue.
Monroe was in poor health, and possibly disoriented from taking cancer medication. Her disappearance touched off a massive search throughout Westchester. Not long after a county maintenance worker reported spotting Monroe at Macy Park in Ardsley some six miles away.
Police had searched park a half dozen times since July, even enlisting police recruits to help cover its 140 acres. Investigators say Thursday's discovery was made in an area that is often underwater.
The Medical Examiner will conduct an autopsy for proper identification and cause of death.