BRENTWOOD -- Police are seeking the public's help in locating a missing 18-year-old who is severely autistic.

Brentwood resident Kolton Chalk was last seen Mar. 8 riding a three-wheeled purple bicycle with a basket around 3:45 p.m., police said.

Chalk, who has brown hair and brown eyes, was last seen wearing a blue T-shirt, blue shorts and wearing a black bicycle helmet.

Chalk is 5-feet-7 inches tall and weighs about 230 pounds. He does not speak and has the mental capacity of a 3-year-old, police added.

He does not have any other medical conditions and does not take medication.

If you see Chalk, contact the Brentwood Police Department at 925-778-2441.

Kolton Chalk, 18, is seen in this handout photo on Saturday, March 8, 2013 in Brentwood, Calif. He is autistic and does not speak. He was last seen riding
Kolton Chalk, 18, is seen in this handout photo on Saturday, March 8, 2013 in Brentwood, Calif. He is autistic and does not speak. He was last seen riding a purple bicycle with a basket and has been missing since March 8. (Brentwood Police Department)

Contact Katie Nelson at 925-945-4780 or follow her at Twitter.com/katienelson210.



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