TALLAHASSEE, Fla. -- The medical examiner who has been widely scorned because he said an autopsy showed that a juvenile boot camp resident died of a blood disease says he's standing by his findings.

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A second autopsy by another medical examiner and with a renowned pathologist attending found that the 14-year-old boy did not die of sickle cell trait, as the first autopsy determined.

The pathologist told legislators Friday that the boy died from asphyxiation and had bruises all over his body.

A video showed Martin Anderson being punched and kicked at the boot camp.

The pathologist says that teenager was probably already brain dead when he was taken to a hospital after the beating.

But initial medical examiner Dr. Charles Siebert said he witnessed the second autopsy and saw nothing to change his mind. Sickle cell is a usually benign blood disorder that affects mostly black people.