He was seen floating at the surface shortly after he had entered the water, with his dive-gear damaged. When two companions tried to recover him into the boat they realised that he had been attacked by a shark.
His entire left leg and part of his abdomen were missing, and his right thigh lacerated.
It is believed possible that Aguilera had jumped from the boat straight onto either a large tiger or great white shark, which had reacted instinctively by biting him. Because of the extent of his injuries, he was thought to have died very quickly.
Police later took possession of the Lidia Isabel fishing-boat as an investigation got under way.