Vicenta Sanchez-Orellana of Oakland was found on Jan. 27, 1991, in a ravine near Castro Valley. Dental records didn't lead to a match on the 24-year-old at first - until a niece in Texas recognized a description of her on a missing persons site.
Sanchez-Orellana had two young children at the time she was killed.
Sheriff's officials say her then-husband, Oscar Orellana, is among several "people of interest" in the case. No arrests have been made.