The court heard a statement from Mr Cooper's parents which said they celebrated his 25th birthday just three days before he died and were in "despair, disbelief and desolation" at losing the "love of their lives".
"We will miss him every minute of every day in a home that now feels empty," they said.
Shawn Tyson was found guilty of murdering British tourists James Kouzaris and James Cooper in Sarasota.
Any murder is brutal. These murders seem especially so. So needless, so random, such a waste.
Jury in the trial of the man accused of killing two British tourists has heard how he feared bullets found by police may incriminate him