The "Dr. X" killings were a series of suspicious deaths by curare poisoning, in 1966 at a Bergen County, New Jersey hospital.[1] A newspaper investigation during the mid-1960s led to the indictment of an Argentina-born physician, Mario Enrique Jascalevich (August 27, 1927 — September 1984), in 1976. He was acquitted at trial in 1978.