A former police chief at the Veterans Affairs Medical Center in Bedford pleaded guilty on Thursday to federal conspiracy charges for his role in two separate plots to kidnap, rape, and murder women and children, authorities said.

Richard Meltz, 65, who has listed addresses in Nashua, N.H. and New Jersey, entered his plea in federal court in Manhattan and faces up to 10 years in prison at his sentencing on May 22, said US Attorney Preet Bharara’s office.