London, May 2 : Elizabeth Fritzl, who was held captive and regularly raped by her father for 24 years, was left alone in her dungeon for three days as she gave birth to her warped father’s twins, it has emerged.

The now 42-year-old Elizabeth watched helplessly as one of the babies died from breathing difficulties in her dank underground prison home.

When evil dad Josef finally turned up he callously tossed the baby’s body into a furnace.

Fritzl, 73, now faces a charge of first-degree murder over the death of the baby, his lawyer confirmed on May 1.

As the full extent of Fritzl’s cruelty emerged, cops said Elisabeth was also left on her own to give birth to other children that resulted from rapes by her dad.

“We thought we were dealing with a monster, but this man is the Devil himself. We think he went off sex with Elisabeth when she was heavily pregnant and left her alone to have her babies underground,” The Sun quoted a police source, as saying.

“All he cared about was satisfying his lust and keeping the terrible secret of his hidden family. The more we learn about him, the more his actions defy belief. He is morally sub-human,” the source added. (ANI)