Luis Perez, 40, was convicted earlier of an unrelated sexual assault case in San Francisco. Perez lived in the Bay area between 1983 and 1999.

San Jose police Sgt. Rob Millard said DNA was used to link Perez to the 1989 death of Nestora McCune, 61, of San Jose, whose partially clothed body was found by road crews cleaning Highway 101 near Brokaw Road in San Jose. McCune was strangled and sexually assaulted, Millard said. That year, police could find no one who might have killed the woman.

In May, Millard questioned Perez about the 1984 unsolved Sunnyvale slaying of Florence Ruth Berropse, 50, of San Jose, which appeared to have similarities to the McCune killing. Police also used DNA to tie Perez to a third killing in San Francisco. However, it was unclear this week whether San Francisco or Santa Clara County would filed a murder charge in that case.

“Based upon information developed in this investigation, police believe Luis Perez may be responsible for more sexual assaults and homicides in the San Francisco Bay area, and possibly other areas of the United States,” Millard said.