Sheri Lynn Muhleman disappeared in 1989 and police say they have reason to believe she was killed.
Even nearly 30 years later, a tip can make all the difference.
A 25-year-old Fremont mother sent her daughter to school on Feb. 27, 1989 and hasn't been seen since.
"About six months ago, we got a couple contacts from people who really wanted to get some things off their chest," said Detective Jacob Blass of the Fremont police. "That happens a lot especially with 20, 30-year-old cold cases where people are like, 'You know what, either I'm getting older, I'm getting sick,' or you know, 'I think I should've come forward at the time but I was just too scared.'"
Police say Muhleman lived with her on-again-off-again boyfriend and father of her child, Michael Abraham.
Abraham and his sister may have been the last people to see Muhleman. His Decoto Road home has since been demolished and is now a church.
Blass says new witness statements combined with evidence found at the home make him suspect a crime. "We ended up looking into it and that wasn't just suspicious, but very much a homicide."
Attempts to reach Abraham were unsuccessful.
If you have any information on Sherri's disappearance, you can contact them at (510) 790-6800