Incest slave Elisabeth Fritzl accuses her father of murdering baby who died in cellar

German news media are reporting today that Elisabeth told prosecutors during four days of testimony against Josef Fritzl: 'He is the killer of my son.'

The child was one of twins born to Elisabeth - and fathered by Fritzl - during her 24-year incarceration in a secret dungeon beneath the family home in Amstetten, Austria. He died with no medical attention and no chance of seeing sunlight.

Accusation: Elisabeth Fritzl, pictured before her incarceration, says her father Josef, right, is a murderer

Germany's biggest newspaper Bild, the RTL television channel and Switzerland's leading newspaper Blick all say today that Elisabeth had directly accused her father of being responsible for the death of the three-day-old baby, born in her cellar dungeon in 1997.

Elisabeth, 42, was freed from the dungeon in April this year after her daughter Kerstin, 19, fell gravely ill and was near death.

Kerstin, together with her brothers Stefan, 18, and Felix, five, had never been outside since being born in the dungeon that Fritzl, 74, constructed in secret beneath the house.

They were among seven of Fritzl's children born to Elisabeth in the cellar but three were removed by their incestuous father to live with him and his wife in their home above.

Dungeon: The secret cellar where the baby was born and died

One baby, understood to have been named Michael, died in the cellar and was burned by Fritzl in the wood-burning stove of the house.

Prosecutors will show Elisabeth's videotaped testimony to child experts who will attempt to discern whether her son's life might have been saved if Fritzl had taken him to hospital. If they think this is the case, he could be hit with either manslaughter or murder charges.

As it is, counts of rape and imprisonment will see him jailed for at least 15 years.

He could face further years inside for child cruelty and grievous bodily harm - Fritzl is known to have beaten his children when they defied his wishes.

Also likely to be taken into account in his eventual sentencing will be forgery, fraud and wasting police time – he told authorities Elisabeth had run away to join a cult and that she 'dumped' babies on his doorstep.

If he is found to be insane he will be confined to a secure mental establishment for the rest of his life.

Fritzl was offered the opportunity to be present at his daughter's interviews but remained in the remand cell where he has been since his arrest in April.

The plight of the cellar victims was revealed after he allowed critically ill Kerstin to go to hospital.