London, May 12 (ANI): Dungeon dad Josef Fritzl, who kept his daughter as a sex slave for 24 years and fathered seven children with her, might be involved in another unsolved sexually-motivated murder of a teenager in the 1960s.

Austrian police are investigating if Fritzl, 73, was involved in the murder of Anna Neumayr, a 17-year-old girl who was found dead in a cornfield near her home in Pfaffstaett bei Mattinghofen in Lower Austria in 1966, says reports.

The girl was killed with a captive bolt pistol, which was used for slaughtering livestock.

"We will investigate whether there is anything to indicate that Josef Fritzl was near the scene at the time," Times Online quoted a police spokesman, as saying.

In fact, within the same year, in 1967, Fritzl was arrested for rape and attempted rape and even spent 18 months in jail. Besides this, he was also arrested for indecent exposure in public.

Fritzl has already confessed of keeping his daughter, Elisabeth, now 42, in a home-made dungeon under the family home in Amstetten in 1984 and raping her for 24 years.

He is also charged for incinerating one of the babies produced from the sexual assaults on his daughter and who died after being born.

This might be the second probe of a murder link involving him, as officers have revealed that they were searching for a possible connection between him and the murder of Martina Posch, 17, who was found near the shore of a lake in western Austria two years later.

Posch, who vanished from her home on November 12, 1986, was found dead and tied-up after ten days on the Mond Lake, near the spot where Rosemarie Fritzl, 68, Josef's wife, had a campsite and guesthouse. (ANI)