Euvelester Villarreal Jr., 48, died aboard the Carnival Dream ship in the early morning hours last Wednesday, officials with the Galveston County Medical Examiner’s Office confirmed to MySA on Tuesday. Villarreal was a resident of Rio Grande City, the county seat and largest city in rural Starr County in the Rio Grande Valley.

Carnival Cruise Line said in a statement that an internal investigation indicated a man who died on the Carnival Dream cruise ship died of natural causes.

An FBI investigation is underway after an incident on a Carnival Dream cruise ship based out of Galveston, Texas, according to multiple reports. KHOU cites law enforcement sources, who claim there is a "death investigation.