City News Service reports the boy died Sunday at Cedars-Sinai Medical Center in Los Angeles, about two hours after the crash was reported in Beverly Park.
Fire Department spokesman Brian Humphrey says the cart was carrying two men and three boys when it overturned.
The 10-year-old boy was rushed to the hospital in grave condition.
The other occupants were not injured.
LA Police are investigating the wreck but could provide no further details.
Beverly Park is a private gated community known for its large homes and famous residents, including Magic Johnson and Samuel L. Jackson.
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