Several guests at the resort reported seeing the alligator swimming in the lagoon shortly before the attack.
Tourist Alfred Smith said he photographed the alligator from his hotel room balcony about an hour and a half before the attack. A short time before the attack, he said, he saw children playing in the ankle-deep water. He was heading out the door to warn them about the alligator when he heard Lane's mother screaming, the wildlife agency report said.
Another tourist, Shawna Giacomini, told investigators her two daughters saw the alligator 1.5 metres from shore about 45 minutes before the attack. The eldest daughter told a Disney employee about it, and that employee went to inform another Disney worker.
The Giacominis went to a nearby store and when they returned the boy had been attacked, according to the wildlife agency's report.
Disney lifeguard Christopher Tubbs told deputies that after the boy was snatched he saw Lane's feet sticking out about six metres from shore.
"He saw the alligator start slash(ing) around and the shoes went under the water and the alligator began its death roll," the sheriff's office report said.
The wildlife agency's report also found:
• Lane did nothing to provoke the alligator and his death is classified as a predatory attack;
• Lane and his family were at the lagoon around 8.30pm, which is considered alligator hunting time;
• Trappers killed six alligators after the attack, but failed to identify whether the offending reptile was captured;
• The man-made Seven Seas Lagoon is not an ideal alligator habitat because the water is deep and clear; and
• The alligator may have had a diminished fear of people by being in an area with lots of humans.
Lane's parents, Matt and Melissa, have said publicly they don't plan to sue Walt Disney World over the death. After Lane's death, Disney World made changes to limit possible visitor contact with alligators on the property.
Workers were building a stone wall around the lagoon and "No Fishing" signs were installed around waterfront areas. Fishing at Disney World was changed to be limited only to excursions.