A 4-year-old boy who died on a Disney ride earlier this year had a rare heart ailment, WESH 2 News reported.

The Orange County medical examiner is set to release full autopsy results Tuesday in the death of Daudi Baumuwamye, WESH 2 News reported.

According to a source who has seen the report, the boy died of cardiac arrhythmia due to heart disease. In June, Baumuwamye suffered a seizure while riding Epcot's Mission Space attraction.

Neither his parents nor Disney will comment until after the report is released.