Police agencies are trying to locate the victim's car, which is described as a Gray 2006 Saturn Ion with blue and white New York plates, registration number AFD7244, State Police said in a news release Friday.
Anyone with information is asked call New York State Police at 845-876-4049 or 845-677-7300.
Troopers had said Friday morning that a homicide investigation was launched after Ferguson was found dead inside her residence, according to News12.
Ferguson was stabbed multiple times, according to the Kingston Daily Freeman.
Divers had searched a pond next to Ferguson's home but turned up no evidence, the newspaper had quoted police as saying.
Police said they received a 911 call at 6:47 p.m. Thursday, but they did not say who placed the call, the paper reported.