Ricky Hatton's son Campbell said "heartbroken isn't the word" as he paid an emotional tribute to his father.
Former world champion Hatton was found dead in his home in Hyde, Greater Manchester, on Sunday.
Police said there were not believed to be any suspicious circumstances surrounding the 46-year-old's death.
In his first public comment since, Campbell posted a series of photographs on Instagram on Tuesday and said: "Heartbroken isn't the word.
"Everybody has always said I was your double - never a truer word said. Looked up to you in every aspect of life.
"Can't explain how much I'm going to miss the laughs we had and all the good times, which I will remember forever. Just can't believe we won't have any more. Love you, Dad."