A statement said police had found no obvious signs of foul play and it was now up to the local coroner to establish the cause and time of Torrence's death.
David Torrence, 31, was from Malibu, CA.
Staff members at the Center Court Condominiums in Scottsdale called 911 about 7:30 a.m. Monday after seeing a man at the bottom of the pool. Torrence was pronounced dead at the scene.
"Today we lost an wonderful athlete and an even greater friend", Kyle Merber, another elite runner and a friend of Torrence, said via Twitter.
"He competed for Peru (birth place of his mother) in the 2016 International Olympics in Rio", the Rotary newsletter notes.
On Twitter, USA Track and Field described the news as "devastating", while New Zealand's double Olympic medallist Nick Willis wrote that "nobody was more dedicated to their running" than Torrence. According to Wikipedia, he held the American record in the 1,000-meter indoor race.
David Torrence celebrates winning silver in the men's 5,000-meter at the Toronto 2015 Pan American Games at the Pan Am Athletics Stadium on July 25, 2015 in Toronto.
Torrence represented Peru at the 2016 Olympic Games in Rio de Janerio. He was also the defending champion, and Merber tweeted that the race will will be renamed in his friend's honor.
Torrence, who was born in Japan and grew up in California, became a standout runner at Cal-Berkeley, and parlayed that into a successful pro career competing both for the US and then Peru.