Duke Perkins in the longtime Chester's Mill sheriff, who genuinely cares about his town, even if he is involved in its dirty laundry. He knows more about the mysterious gas tanker trucks that have been seen coming and going than he is saying, although he believes he is doing what is right for the town. He thinks James Big Jim Rennie is power hungry, but he also appears wary or afraid of him.He is a mentor to Deputy Linda, but he does not tell her everything. His training of her will soon be put to the test in life under the dome.Sheriff Duke has a pacemaker that reacts to the dome.