Read more on the Brian Thompson shooting UnitedHealthcare CEO killing: Luigi Mangione held without bail on gun, forgery charges UnitedHealthcare CEO shooting: Photos show face of person sought by NYPD for questioning Deny, defend, depose: UnitedHealthcare CEO killing shell casings had words written on them UnitedHealthcare CEO Brian Thompson fatally shot in targeted attack, gunman still at large UnitedHealthcare is the largest private health insurer in the United States, with more than $200 billion in annual revenue. The U.S. Senate Permanent Subcommittee on Investigations in October released a report that found UnitedHealthcare, Humana, and CVS “each denied prior authorization requests for post-acute care at far higher rates than they did for other types of care, resulting in diminished access to post-acute care for Medicare Advantage beneficiaries.” Medicare Advantage offers health benefits under the federal Medicare program that are managed by private insurance companies. Mangione, whose sister is a doctor, reportedly has suffered from chronic back pain for years. The profile of his account on the social media account X contains an x-ray image of a person’s back with screws in it. Thompson’s family held a private funeral for him in Minnesota earlier Monday, as Mangione was being taken into custody and questioned by Altoona police. Police said that a backpack with Mangione when he was confronted at the McDonald’s was found to contain a gun, silencer, and multiple rounds of 9mm ammunition. Combination showing UnitedHealthcare CEO Brian Thompson (L) and person of interest Luigi Mangione (R)