MONROVIA (CBSLA) — As the sun set in Monrovia Friday evening, a group of people gathered around the fountain at Library Park to light candles at a vigil for Amanda Custer — a woman who has been missing for nearly three weeks.

“She’s somebody that doesn’t deserve to be lost,” Carmen Martinez, the organizer of the event, said.

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Martinez met Custer just before her July 29 disappearance through her community Facebook group, Monrovia Happenings. Martinez said Custer reached out, and helped her husband find a job.

“She’d talk to complete strangers to try to help others,” Martinez said.

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The Los Angeles County Sheriff’s Department believes that Custer’s ex-boyfriend, Robert Camous, seriously injured her at his Monrovia home and placed her in the trunk of his car. Police found blood at the home and a tarp, digging tool and more blood in the trunk.

Investigators now know Camou then traveled to Sierra Avenue in Fontana where he was caught on camera at a gas station. Search and rescue teams have also searched Mount Baldy Road and the Lytle Creek area. Police apparently were able to track Camou for a while through an ankle monitor he was ordered to wear for a previous assault case.

“It’s like looking for a needle in a haystack,” Martinez said.

Even more disturbing was the fact that Camou was apparently caught on camera at a bar in Los Angeles rapping about killing and burying someone. Camou was arrested shortly after that video was filmed.

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Police are now offering a $10,000 reward for the resolution of this case.