The Ledger reports that Clayton McLaughlin was pronounced dead at a Tampa hospital Sunday.
According to the Polk County Sheriff's Office, Clayton's family brought him to a fire station after the crash.
Investigators said Clayton was a passenger in an ATV being driven by an 8-year-old boy. The boys were riding on a dirt track in Lakeland when the ATV struck two dirt mounds and flipped onto its side.
The ATV landed on Clayton. Authorities said he suffered "massive head injuries." The 8-year-old driver was not injured.
Authorities said the boys initially wore helmets but removed them after taking a break and did not put them back on.
Information from: The Ledger (Lakeland, Fla.), http://www.theledger.com
Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.