LANCASTER (CBSDFW.COM) — Lancaster Police are searching for a 65-year-old man diagnosed with cognitive impairment who was last seen on Monday night.

William Francis Johnston was seen traveling on foot at 9:20 p.m. at 1354 Roan Drive.

Johnston is described as standing 5-foot-10 and 260 pounds, with gray hair and green eyes. He is believed to be wearing a white shirt with green swim trunks.

Authorities believe the senior citizen’s disappearance poses a credible threat to his own health and safety.

Anyone with information regarding his whereabouts is encouraged to contact the Lancaster Police Department at 972-218-2711.

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