Authorities in South Carolina say the mother of the child is now in custody, WSOC-TV reports.
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Chesterfield County Sheriff Jay Brooks said on Tuesday afternoon he doesn't believe there was a kidnapping, as reported to deputies. The suspect is being questioned in the death of the child.
The Chesterfield woman originally told police she was walking to check her mailbox around 2 p.m. when a tan and gold colored SUV stopped in the middle of the road.
At that point, she said, a man wearing a black coat, toboggan and one black glove got out of the vehicle and punched her multiple times in the head.
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She said the man then grabbed her baby and took off in the SUV.
An Amber Alert was issued for the child a short time later.
Sheriff Brooks said the child was found dead in a diaper box in a field about 1,000 yards behind the family's home.