"We have stringent standards for the content of listings on our platform", the spokesperson added. "We are conducting a thorough review and are strengthening our monitoring processes." It is not known for how long the image was used, or who the company was that was selling it on the Chinese company's website. Many online have speculated the image was created using artificial intelligence (AI) - but it remains unclear how the picture was made. In April, Luigi Mangione pleaded not guilty to all federal charges brought over the fatal shooting of Mr Thompson.

Luigi Mangione, the man suspected of killing the chief executive of UnitedHealthcare, underwent surgery and was reported missing in San Francisco before the shooting. Brian Thompson, 50, CEO of the healthcare insurance giant, was gunned down last week in Midtown Manhattan, spawning a five-day manhunt that eventually led to Mangione's arrest at a McDonald's restaurant in Altoona, Pa. Questions about Mangione's alleged motives and background have swirled in the media since his arrest Monday. As prosecutors worked to bring him to New York to face charges, new details emerged about his life and his capture. The 26-year-old Ivy League graduate from a prominent Maryland real estate family was charged with murder hours after his arrest.