Sheri Lynn Muhleman disappeared in 1989 and police say they have reason to believe she was killed.
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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.
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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