Navajo, N.M. » A 64-year-old nun has been found dead in her residence at St. Berard Mission Church on the Navajo Indian reservation, and authorities believe she was murdered.

The FBI says Sister Marguerite Bartz failed to show up to Sunday Mass so a colleague went to check on her and found her body.

Her vehicle, a beige 2005 Honda CR-V, is missing. It has a New Jersey license plate, NF24821.

The FBI and state police are combing Bartz's residence for evidence, and an autopsy is planned.

FBI Special Agent Darrin Jones would not say how Bartz died.

Investigators would like to speak with anyone who talked with Bartz on Halloween night or anyone who believes they may have information related to the case.

Jones says any detail, however small, could help.