Former presidential candidate Gavin Duffy said his identity has been used online to scam people out of money.
The 'Dragon's Den' star said he found about his 'death' online a few weeks ago.
He told Lunchtime Live his credentials are used to con people outside Ireland into giving up their money.
"The news of my apparent demise was just a few weeks back when I started getting phone calls from people."
"Despite the rumours of my demise a few weeks back, saying I passed away, and I'll explain why they decided to put that twist on the story.
"My identity has been robbed by internet fraudsters - well, used and abused.
"Before I died, by the way, I had made millions apparently from bitcoin.
"For the record: I've never, ever invested in bitcoin or any crypto currency - but there's this story going around.
"And you'll see the story from time to time in the past, and it's still persisting a little bit - despite my efforts through a London cyber-security consultancy to stop it or at least curtail it.
"The same story goes around about Michael O'Leary."
Mr Duffy said his name is being used as he is associated with internet searches relating to investments.
"The London security consultants explained to me, whilst Michael O'Leary's a much more successful businessperson than I ever have been, I search very well as an investor.
"The number of times in various online posts over 10 years of 'Dragon's Den' I've been described as an investor.
"And this is aimed not at people in Ireland, it's more people in the UK - they're sort of familiar, there's other 'Dragon's Den' programmes around the world.
"They see this guy - 'A Dragon? Oh, he's made millions from bitcoin' - they do a little bit of a search separately and I come up as a credible person.
"And then they go to a particular website and they're ripped off."
"I've been persistently hounded, used and abused by an operator that we've located to Panama, they route it out of a WhoisGuard system Cloudflare in Singapore, so it's very hard to find out who they are".