The FBI is investigating the death of a Texas man on the Carnival Dream cruise ship, with no trauma signs evident.

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.

According to Carnival's schedule for a six-day cruise, the Dream left Galveston last Sunday, July 20. By Wednesday, the ship was traveling between Belize and Cozumel, Mexico, when multiple passengers reported hearing alarms go off in the middle of the night.