Sandra Cifuentes, possibly also known as Sandra Cifuentes Arboleda, was 24 when she vanished from the grounds of Marlboro Psychiatric Hospital in Marlboro, New Jersey. She was last seen on May 11, 1997, wearing blue jeans and a tan and blue jacket. She is described as a Hispanic female with black hair and brown eyes, 5 feet 1 inch tall and about 170 pounds. Distinguishing marks include two small scars on her upper right arm and a larger thigh scar from a 1991 injury that required thirty stitches.

Her disappearance occurred while the hospital was closing and transferring or releasing many patients, a chaotic period that has complicated the case. Sandra suffered from a mental illness, which made her especially vulnerable during that transition. The New Jersey State Human Services Police are handling the investigation; her family has submitted DNA and her case remains listed in national missing persons databases. Few significant leads have developed and the case remains unsolved.

If anyone knew Sandra, saw her around Marlboro Hospital in May 1997, or has information that could help locate her, please come forward.