SACRAMENTO, Calif — There are 644 active missing children cases in California, according to the National Center for Missing and Exploited Children. One of those children, Vallejo teen, Pearl Pinson.
In May 2016, the 15-year-old was kidnapped on a footbridge of Interstate 780 while walking to school.
"Four years later, it's 50/50 now," said Pearl's sister, Rose Pinson. "She may be alive, she may be passed."
The lone suspect was killed in a police shoot out the next day. Leads on her whereabouts went cold. Still, Rose said she has hope Pearl will be found.
"We just want to find her or her remains," Rose said.
Her family keeps Pearl's story in the public eye in hopes someone with information will step forward. Rose said developments on Kristin Smart's decades-old case is energizing.
Smart disappeared in 1996 after leaving an on-campus part at Cal Poly University, San Luis Obsipo.
On Wednesday, law enforcement officials investigating the Kristin Smart case announced they served search warrants at two locations in San Luis Obispo County, one in Los Angeles County and one in Washington state.
"It's amazing," Rose said of the new details in Smart's case. "I'm just glad that her family finally [may get] the closure and get the answers they've been looking for."
Police said they never gave up on the Smart case, and Rose said it's a reminder of all the other children that families are still searching for.
"[Don't] forget about all these cases of people who are missing, and keep hope out, eyes out, for all these people," Pinson said.
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WATCH MORE: What we know so far in the Kristin Smart case