The boy’s father is a suspect in the case that authorities are treating as a homicide. He has been detained and is cooperating with authorities, the sheriff’s office said.

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On Sunday afternoon, investigators "developed information that the child's body might be located in the 7100 block of Dalhberg Road," the sheriff’s office said. At about 1 p.m., the body of an infant was located in a wooded area near that location, about a mile from his home.

A massive search effort began Friday morning after the boy vanished from his parents' doublewide trailer east of Custer.

Deputies said the boy’s 42-year-old father put his son to bed Thursday night and got up later to give him a bottle of milk.

The father told detectives he woke up Friday to find the child gone and the trailer door open, but nothing else was amiss.

The father’s 26-year-old wife, Brooke K. Johnson, the baby's mother, was jailed Thursday after being sentenced to prison for robbery. Details of that case have not been available.