ORLANDO, Fla. -- The Orange County Sheriff's Office has just released the final investigative report into the death of a 2-year-old boy at Disney's Grand Floridian.

Police initially received a call on June 15 that had stated a young child had been taken by an alligator. That two-year-old child was later identified as Lane Graves.

The full report released Monday afternoon stated the father of the two-year-old boy, Matt Graves, engaged in a fight with the gator to prevent it from taking his son. Police say Graves was unable to keep Lane from going under the water.

Police say the the father ran to a lifeguard at the resort and started yelling, "Please come help my son, a gator got him." The witness told police that the father had blood all over the right side of his face and right hand.

A 16-year-old witness told police the following:

"We were on the walkway from the cafe leading to the beach area and I saw a family of five down by the beach right by the water. I looked away from them for a second and then heard a scream and saw the 2-year-old child (victim) being taken away by an alligator. The alligator first came in head first towards the beach but turned around once it had the child in it's mouth and crawled back into the water head first. I did not see when the alligator grabbed the child in its mouth. I saw what seemed to be the child's father jump on the back of the alligator and started punching it. He seemed to have lost his grip and the alligator got away into the water. "

The search lasted well over 16 hours and was conducted by members of the Sheriff's Office and the Florida Fish and Wildlife Commission. Searchers and divers used sonar in their attempts to find the toddler.

The boy was near his family when the gator attacked, Demings said. He was playing in the shallow area of the water with a slightly older boy. A "No Swimming" sign was posted at the lagoon.

Police say the Graves family had gone down to the beach to watch a planned movie scheduled by the hotel. The report states that movie was canceled due to incoming inclement weather. According to the report, the Graves' then decided to walk over to the edge of the water.

Police say Lane had a small plastic bucket and was walking over to the wet sandy area to scoop wet sand to bring it back to the dry sand and build a sand castle.

Police say the father was standing by his son when the gator quickly grabbed his son by the head. Police say the father instinctively grabbed the gator by its snout.

The medical examiners officer determined the cause of death to be cranio-cervical trauma and drowning.

Police say the case is now closed.

PHOTOS: Authorities searching for child dragged away by gator