SHERMAN, Texas (CBSDFW.COM) - The Grayson County Sheriff's Office issued a Silver Alert Monday afternoon for a missing 89-year old man from Sherman who has been diagnosed with a Cognitive Impairment.

89-year old Juan Dedios Bernal (W/M 5' 5" 150) was last seen at 6:00 am Monday morning on Smith Oaks Road in Sherman driving a maroon, 1998 Chevy truck with TX plates BM12940.

Mr. Bernal has gray hair, brown eyes and was last spotted wearing a white t-shirt and blue jeans.

Law enforcement officials believe Mr. Bernal's disappearance poses a credible threat to his own health and safety.

If you have any information regarding this missing senior citizen, contact the Grayson County Sheriff's Office at 903-813-4200.

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