Gareth Gates has said that he has been left "heartbroken" by the death of his friend Darius Danesh.
The singer and stage star was found dead in his US apartment last week at the age of 41, with no cause of death immediately apparent.
Gates and Danesh appeared together on the inaugural series of Pop Idol in 2002, eventually finishing second and third respectively, and have remained in contact over the last two decades.
"I can't quite believe the news of my dear friend Darius passing. I'm heartbroken," Gates, now 38, told The Sun.
"Darius took me under his wing during our time in Pop Idol, like a big brother; always looking out for me and for that I thank you my friend.
"I will miss our chats. He was one of the most beautiful, intelligent and gentle souls I was lucky enough to know, a soul that lit up every room.
"Goodbye my friend. Forever in my heart."
Medical examinations are continuing in an attempt to determine the cause of the star's death.
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