Christopher M. Payne, accused of killing his 4-year-old daughter has been placed on suicide watch at Pima County Jail's mental-health unit.
Payne also has a 5-year-old son, Tyler Payne, who is missing under suspicious circumstances.
Sheriff's Bureau Chief Warren Alter said Payne was put on suicide watch shortly after he was booked into jail March 1 on charges of first-degree murder and child abuse in the death of his daughter, Ariana.
Police also are searching for Payne's son, whom they fear has fallen victim to foul play.
Police have not said specifically they believe Tyler is dead.
The night of Payne's arrest, officers began a search of the Los Reales landfill. The search resumed the next morning and was halted later that day without turning up any evidence in the Payne case, police said.
Police would not say if they were looking for Tyler's body.
Police have not publicly called Payne a suspect or a person of interest while they investigate what happened to Tyler.
Detectives have not conclusively identified the dead girl as Ariana, but, while they await the results of forensic tests, they have said they presume the tiny body in the locker to be hers.
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