Tucson Police Department

A Tucson, Ariz., man was arrested after a foul odor led police to discover he had been living with his mother's decomposing corpse.

"The person was found in a bathtub, I believe, and may have either been bound or was found in some circumstance [for police] to believe she may not have died naturally,"  Dr. Gregory Hess, Pima County's Chief Medical Examiner, told ABC affiliate KGUN-TV in Tucson, Ariz.

The gender and identity of the body was not immediately apparent to officers at the scene, given the state of decomposition.

The Pima County Medical Examiner's Office determined the body was that of Carmelita Aguilar, 47. Aguilar's son, Christopher, 25, had been living with her body for an unspecified period of time.

"He was aware that a person was deceased inside the apartment and concealed the death for some time while continuing to live in the apartment," Sgt. Maria Hawke of the Tucson Police Department said in a statement.

Aguilar was arrested on a charge of abandonment/concealment of a body. Authorities said they have not yet determined whether Aguilar was responsible for his mother's death.