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25-year-old man vanishes on New Year's Eve in Sacramento

Alexander Holden is the nephew of former Missouri Gov. Bob Holden and the son of two Missouri judges. His family said it is unlike him to disappear.

A 25-year-old man vanished in Sacramento, California, on New Year's Eve morning, prompting a search by police and his family.

Alexander Holden was last seen in the city's downtown at around 2 or 3 a.m. Tuesday, police said. His family said it is unlike him to disappear.

Image: Alexander Holden
Alexander Holden.Sacramento Police Dept.

Margaret Palmietto, Holden's mother, told NBC affiliate KCRA in Sacramento that he had plans with his girlfriend and friends Tuesday night but he did not show up.

"My son's girlfriend called me because she hadn't been able to contact him and asked me to try and contact him and I couldn't either," she said.

A spokesperson with the Sacramento police said the circumstances around Holden's disappearance are not immediately clear. On Friday, authorities conducted a wide neighborhood canvas in an effort to find him.

"We are urging the public to reach out to us if they have any information regarding his disappearance," Officer Karl Chan said in an email to NBC News on Saturday.

Holden's girlfriend, Kennedi Perri, posted a desperate plea on Facebook for his safe return.

"Alex, we will not give up. We love you so so much, and will do anything to have you home soon, safe and sound. You mean the world to so so many people, and we are all praying and praying for your safe return. Please. I love you so much," she posted Saturday.

Palmietto told KCRA that if there's any way that Holden could hear her, she wants him to know they're not giving up.

"Alex, we're trying to find you," she said. "You have people in Springfield, you have people here. People are trying to fly here, get here as fast as they can, although there's not much they can do."

Palmietto and Holden's father, Calvin Holden, are both judges in Greene County, Missouri, according to the Springfield News-Leader. His uncle is Bob Holden, a former governor of Missouri, The Associated Press reported.