Melbourne, Mar 18 : Dungeon dad Josef Fritzl has pleaded guilty to all the charges with which he has been charged, including murdering one of the children he fathered with his daughter Elisabeth, whom he kept as a sex slave for 24 years.

At the start of the third day of his trial, the Austrian engineer changed his plea to guilty on all charges, including the murder for which he faces a life sentence.

"I plead guilty to the crimes I''ve been charged with," News. com. au quoted him as saying.

Fritzl had earlier pleaded guilty to the charges of rape, incest, false imprisonment and coercion, but denied an allegation of slavery and murder.

When asked by the judge what had caused him to change his plea, the 73-year-old said: "My daughter''s videotaped testimony."

Fritzl added: "I''m sorry." (ANI)