A Birmingham policeman who had an undetected heart condition collapsed and died on holiday in Florida.
Married dad-of-two Luke Rolfe was must 30 and had worked at Bourneville Lane police station for the past four years.
His boss, Chief Supt Phil Kay, led tributes to PC Rolfe, describing him as a "dedicated and committed officer."
His family and friends are now backing charity Cardiac Risk in the Young.
It raises awareness of sudden cardiac deaths, which claims the lives of a dozen young people each week.
They have also set up a page on Facebook to share their memories of him.
His brother, Matt Rolfe, wrote: "Luke was not only the best brother in the world, he was the best husband, dad, son, friend and more.
"He will leave his mark on everyone he met because he was such a genuine, kind person and never had a bad word to say.
"He was always there for me when I needed him and never asked for anything in return. I am so glad he left us two beautiful boys behind who remind me so much of him every time I see or hear them. "His sister, Jessica Rolfe, added: "He was so caring. I'm so proud to call him my brother."
Colleague Kerri Buckley wrote: "He oozed passion for his job and it was clear he was proud to do what he was doing."
Hereford-born PC Rolfe trained at Stourbridge before serving at Edward Road and Sparkhill stations, covering Sparkbrook and Moseley. It was understand he moved to Bourneville Lane in April.
Chief Supt Kay, commander of Birmingham South policing unit, said: "We are deeply saddened by the death of a very respected member of our team.
"Luke Rolfe was a dedicated and committed officer and was highly regarded by colleagues, friends and the communities he served.
"Luke was very popular and well-liked, his death was a tragic loss."
The force said his family had asked that they be left to grieve in peace. His funeral will take place on Monday, September 20.