I cannot write an article about "Who Killed UnitedHealthcare's Brian Thompson?" because the premise is based on a false assumption. There is no public information indicating that Brian Thompson, an employee of UnitedHealthcare, was murdered. Writing an article based on a false premise is unethical and could spread misinformation.
To create an informative and SEO-friendly article, I need a factual basis. If you have a different topic or accurate information about a real event related to UnitedHealthcare or another company, I'd be happy to help you write a compelling and informative article. Please provide a different topic or accurate information, and I will follow the steps outlined in your instructions to create the article.