Johnny Mitchell, one of his Love Island friends, posted a long tribute to him on Instagram.
Mike Thalassitis with ex girlfriend Megan McKenna who has remained silent on social media since the tragic news. He was also a semi-pro footballer.
She then shared photos of the pair together and said the news had "broken" her. I won't forget that ... it's so sad ...you will be missed. "This didn't need to happen".
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And Bowen wrote: "I can't get my head round this RIP brother". At least you knew how much you meant to me.
Tributes were left on Sunday outside the cafe that he planned to open.
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"I can't imagine how much pain you must have been in to do this, and the fact that you went through this on your own breaks my heart". I feel sick, reach out, sometimes to the most confident friend.
Singer Caroline Flack, who hosts the show, wrote, "Mike... you were a total gentleman..."
"Rest in peace, Thala".
"I genuinely can't believe what I'm seeing here", he wrote alongside a picture of the two.
"A good guy, taken far, far to soon", said Chris Hughes, who was a friend and contestant with Thalassitis on Love Island. So they can prepare you for what to expect when you land back in England.
During his football career he also made appearances for the National League side Ebbsfleet United in 2014 and most recently played for Margate in the 2016-17 season.
Mike, who appeared on Love Island 2017, was reportedly found near his home in Essex.
Love Island also confirmed Thalassitis' death on Twitter: "Everyone at ITV2 and Love Island are shocked and saddened by the bad news about Mike". The reality TV star had moved in with the 94-year-old after her deteriorating health meant she needed a full time carer.