John Gilligan will go on trial in Spain today on drugs and weapon charges.
It comes ahead of a three-part programme about the convicted drug dealer which begins on Virgin Media tonight.
Veronica Guerin's brother and the Minister for Drugs Strategy are among those who've expressed concerns about the programme.
The producer of the show, David Harvey, is defending it:
"I believe stories like this should be told. To think this is some sort of crass piece of tv is not true. It is Gilligan telling his story, but Gilligan telling his story within a framework that allows the truth to come out".
