There is a major development in the investigation into the "double initial killings." Joseph Naso's semen has been found on the pantyhose of a woman, murdered in 1977.

According to testimony, his ex-wife Judith's DNA was also found on those pantyhose.

Investigators think Naso used them to strangle 18-year-old Roxene Roggasch to death.

She's one of four women Naso is accused of several killings in the 70s and 90s.

Naso says he does not believe in DNA results and denies ever having had contact with Roggasch.