Two guests at the Casa Sur Palermo, where the One Direction star was staying, said he was displaying disturbed behaviour just moments before he died.
Bridegroom Bret Watson, from Chicago, recalled several encounters with Liam ahead of his wedding.
He said: "Multiple times [Liam] had come down to the lobby, was causing a disturbance, kept being escorted back to his room.
Frustrated
"There was an incident where he was very frustrated and was smashing his laptop in the lobby. And then the final time he came back down, he actually passed out in the lobby of the hotel, started, looked like [he was] convulsing a little bit and had to be physically taken back up to his room.
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