Ethan Willis is an Army Colonel assigned to work at Angels Memorial Hospital.
He was a military doctor who was assigned to work at Angels by the CCCRP.
He has never had any romantic interests, until he was assigned to work out in the field and developed feelings for paramedic Rox Venezuela.
He has a father, but they do not have a good relationship. He was very close with his brother Robert, but he committed suicide after and incident in one of his tours in Afghanistan.
He has a strong friendship with Leanne Rorish, an attending at Angels Memorial Hospital.
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