Tampa, Fla. ? A 14-year-old boy kicked and punched by guards at a juvenile boot camp died because the sheriff’s officials suffocated him, a medical examiner said Friday, contradicting a colleague who blamed the death on a usually benign blood disorder.

“Martin Anderson’s death was caused by suffocation due to actions of the guards at the boot camp,” said Dr. Vernard Adams, who conducted the second autopsy.

Martin had been sent to the Bay County boot camp for violating probation by trespassing at a school after he and his cousins were charged with stealing their grandmother’s car from a church parking lot.

Martin’s family had questioned the initial finding by Dr. Charles Siebert, the Bay County Medical Examiner, that the boy died of complications of sickle cell trait.