The Brief Shein is investigating how an image that appears to look like accused CEO killer Luigi Mangione appeared on its website. Mangione is accused of killing UnitedHealthcare CEO Brian Thompson in Manhattan on Dec. 4, 2024. Popular fast-fashion retailer Shein is looking into how Luigi Mangione, the man accused of killing UnitedHealthcare CEO Brian Thompson, appeared on its website modeling a shirt. According to BBC News, the image appeared to show Mangione modeling a white floral short-sleeve button-down shirt that was on sale for less than $10. Who is Luigi Mangione?