But he was determined to have killed a Chinese girl in San Francisco. The murder happened more than a year before Ramirez was arrested, and not connected to him for more than 20 years.
From Wikipedia:
On April 10, 1984, Ramirez murdered Mei Leung, a 9-year-old Chinese-American girl, in the basement of his apartment building in the Tenderloin district of San Francisco. Leung was with her 8-year-old brother and reportedly looking for a lost one-dollar bill when Ramirez approached the girl and told her to follow him into the basement to find it. Once they were in the basement, Ramirez beat, strangled and raped Leung before stabbing her to death with a switchblade, hanging her partially nude body from a pipe by her blouse.The killing was not linked to Ramirez until 2009, when his DNA was matched to a sample obtained at the crime scene.
He lived nomadically between L.A. and the SF area.