Aaron Connor, 21, was found unconscious in the toilets of a café in the city centre on 16 November. His family say he had taken a heroin overdose.
His father, Christopher, told BBC News NI that drug use is a growing issue across the city and will destroy families across Northern Ireland.
"Drugs have ruined our family - it's ripped our family apart," he said.
"That was the hardest thing I've had to do - telling my wife that our baby, our son, was dead," he said.
"My wife is broken. She can't sleep, she's crying, and I feel useless because I can't mend my wife."
Last weekend, the Public Health Agency issued a warning to agencies saying that five people died from a suspected drug overdose in just two days across Belfast.
Source: Kelly Bonner, BBC News, 25th November 2019
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