Sheriff Ethan Miller, formerly Deputy Miller, is a character appearing on the WB/CW television series Smallville. He first appeared as a minor supporting character before becoming the main antagonist of the Season 2 episode "Suspect."
He was a good friend to the Kent family, and was well-liked by the community of Smallville. He first appeared as a deputy before being promoted to Sheriff.
He was portrayed by Mitchell Kosterman.
Ethan was close friends with Jonathan Kent while they were both attended Smallville High; even signing Jonathan's yearbook with the message "To Jonathan, a great quarterback; a better friend."
He was also the first Smallville resident to meet Jonathan and Martha's newly-adopted son, Clark. Ethan continued working for the Sheriff's department, eventually becoming sheriff. Sheriff Miller was always on the scene involving meteor infected incidents where it came to Earl Jenkins or Harry Volk.
In "Suspect," Ethan was secretly working for Lionel Luthor, providing him with background information on LexCorp's Board of Directors so Lionel could blackmail them into selling their shares and thus buy-out LexCorp. He then threatened to expose the sheriff if he didn't continue to do favors for LuthorCorp from time to time. Deciding to terminate their arrangement since he couldn't meet Lionel's demands, he sneaked into the Luthor Mansion and shot Lionel.
Ethan then made the difficult choice to frame Jonathan Kent and had Mike, another high school friend, drug Jonathan at the Wild Coyote and laid out evidence that led to Jonathan's arrest. To cover his tracks, he killed Mike and left his body in the freezer at the Wild Coyote. His plot, however, was uncovered by Clark, and he was arrested serving a prison sentence for murder.
Ethan was later replaced by Nancy Adams.