The parents of a Connemara teenager, who was killed in 1998, have urged the State to keep their daughter's killers in prison for the rest of his life.

Siobhan Hynes was just 17 when she was raped and murdered at a remote beach near Carraroe, Co Galway in December 1998.

Just over two years later, local man John McDonagh was sentenced to life in prison for her murder, plus a 10-year concurrent sentence for rape.

However, Siobhan's parents Andy and Bríd Hynes are fearful that they could soon come face with face with their daughter's killer, after it emerged that Mr McDonagh's sentence could soon be coming to an end.

In a new TG4 documentary which will be broadcast tomorrow night, Andy Hynes calls on the State to extend sentences for killers, to ensure that victims' families never have to meet them again.

Siobhan's mother says the horrific manner of her daughter's death still haunts her, and her life will never be the same again.

The documentary will be screened on TG4 at 10.20pm tomorrow night.