Police release shot tourists' 911 call
Details of the call came as Mr Cooper's devastated parents described their son as a gentle, kind and compassionate man whose "humour filled every space".
CCTV footage has also been released of the men talking to two women in a bar in Sarasota, shortly before they died.
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Hide AdThe caller, who was unsure of their exact location, told the operator: "We saw a white boy, he was just laid out, there was blood everywhere."
Mr Cooper's parents, Stanley and Sandra, from Hampton Lucy, near Warwick, had been on holiday with their son - who worked as a tennis coach in Warwickshire and once played Andy Murray in a junior tournament - and his friend, staying in an upmarket area of Sarasota, around 12 miles from where the pair were killed.
A 16-year-old boy called Shawn Tyson has been arrested over the killings - but there is no known link between him and the men.
Police said the teenager would be charged as an adult over the two murders, which means he could face the death penalty if convicted.