Peter Mulryan

This is Gareth O'Callaghan, a former DJ with Radio Dublin and 2FM, who has always harboured doubts about the connection between Eamonn Cook and Philip Kearns.

It didn't make sense to me because he was in a very, very late stage of Alzheimer's.

How could they extract confession from him?

They said he confessed to knowing Philip.

And I think that set the cat among the pigeons and immediately decided for a lot of people, this is the guy he knew Philip.

Someone else this didn't make sense to was another of Eamon Cook's daughters.

Another daughter of Eamon Cooks provided us with a statement for this series, some of which we use in this episode, and all of which you can hear in our bonus episode, which follows.

Even though she didn't grow up in the care of her father, she did visit him in his final weeks in the hospice.

Someone who felt compelled to go to Gardaí in 2016, when the Cook and Philip Kearns story emerged, was Gary Byrne.

There was a great buzz around the station then because the phones were hopping, the ads were coming in, money was coming in.

Aged 14, Gary was a year older than Philip Kearns.

Gary worked part-time in Radio Dublin, including through October 1986, the month Philip vanished.

Though a courageous witness brought Philip's case back into the spotlight, despite searching Cook's properties, Garthy found no evidence or DNA linking him with the crime.

Still an active missing persons case, Philip's case may be upgraded to a murder inquiry later this year, marking 40 years since he vanished.

Eamon Cook died on June 4th, 2016, a day Siobhan and Anne still remember.

His problem was not that he was evil.

Less than a dozen people attended Eamon Cook's funeral in Glasshaven Cemetery.

Even in death, he extracted one last act of control, being buried with his first wife Lena, the woman whose relations believe was murdered by electrocution.

Eamon Cook's death marked the end of fear for many of his victims, but he left behind an unimaginable legacy of damaged lives.

This is Mary again, who has never spoken publicly until now.