A Georgia man wanted in the death of his girlfriend's 1-year-old son was arrested Wednesday after authorities found him hiding under a bed in his mother's house, an official said.

Jamarius Khalil Dixon, 19, was taken into custody in the Sandersville, Ga., home a week after he and the child's mother found the boy unresponsive and rushed him to a hospital, an official with the U.S. Marshals Southeast Regional Fugitive Task Force told the Macon Telegraph.

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The child, identified as Jayce Gibson, was pronounced dead at the hospital, the Bibb County Sheriff's Office said in a statement. A cause of death could not be determined at the time.

An autopsy later showed that the 1-year-old died of head trauma, authorities said.

An investigation identified Dixon, who was described as the "roommate/boyfriend" of the child's mother, as the suspect, the sheriff's office said.

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No details on what led authorities to suspect Dixon were immediately provided.

Dixon was charged with murder and first-degree cruelty to children. He was being held without bond at the Bibb County Law Enforcement Center.