Cimarron’s grandparents, Peggy and Dale Thomas, spoke of their grief in a victim impact statement read in court.

“Our lives will never be the same,” they said.

“We didn’t get to see her graduate, walk down the aisle or have children.

“We were robbed and our lives were changed forever.”

Peggy and Dale take part in an upcoming BBC documentary on McCartney, where they remember their granddaughter but talk about their grief.

The three-part series, Teen Predator/ Online Killer, which looks at this case in more detail, will be available on BBC iPlayer, BBC One NI and BBC Three in the coming weeks.

The DoubleBand Films series is told from multiple perspectives and includes access to international investigative teams led by the Police Service of Northern Ireland and interviews with Cimarron’s family and some of those who were exploited and abused by McCartney.