A New Mexico teenager suspected of killing a nun on the Navajo Indian reservation reportedly tried to commit suicide over the weekend.

Albuquerque television station KRQE reported Monday that 18-year-old Reehahlio Carroll tried to kill himself in the Window Rock, Ariz., jail on Friday, the day after he was arrested in the case.

Carroll reportedly was treated at a Fort Defiance hospital and then returned to his cell and put on suicide watch Saturday.

Federal authorities have accused Carroll in the death of 64-year-old Sister Marguerite Bartz, who served at St. Berard Catholic Church in Navajo, N.M.

Bartz's body was discovered in a pool of blood Nov. 1 by another nun, who went to check on her after she failed to show up for Mass.