17:00 BST
The litany of McCartney’s crimes spanned continents.
BBC News NI has spoken to a man from New Zealand, we’ve called him Stephen (not his real name), about the abuse suffered by his two girls, after McCartney struck up a friendship with his eldest daughter, then 12, on Snapchat.
The girl, we’ve called her Rebecca (not her real name), believed that she was talking to another girl, and had no idea it was McCartney.
The friendship grew over a period of a few months.
Then McCartney asked Rebecca for a nude photograph, which she sent.
“He then used that to manipulate and blackmail her into sending more photos, which ended up including our youngest daughter as well as part of the blackmail,” Stephen said.
“And then, in time, through her contact list on Snapchat he added Rebecca’s cousin as well, who was older at the time, and he then tried to threaten her with getting more photos.
“Thankfully, she was mature enough and smart enough to reach out to my wife, and then we went straight to the police from there.”
Read more on this here.
Image source, Getty Images