Calvin Alexander was last seen around 12:30 p.m. on Oct. 15, at the Star of Hope shelter in downtown Houston in the 1800 block of Ruiz Street.
According to police, Alexander was diagnosed with memory loss, dementia, and depression.
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Anyone with information in regards to his whereabouts is urged to contact HPD at (713) 884-3131 or the Missing Person's Division at (832) 394-1840.