UnitedHealthcare CEO Thompson was gunned down from behind on a Manhattan street just before dawn on December 4, prompting a nationwide manhunt which ended five days later with the arrest of the suspected killer, 26-year-old Ivy League graduate Luigi Mangione.

About 8 in 10 U.S. adults said the person who committed the killing has “a great deal” or “a moderate amount” of responsibility for the Dec. 4 shooting of Brian Thompson, according to a new poll.

Luigi Mangione, the man accused of fatally shooting Brian Thompson, the CEO of UnitedHealthcare, pleaded not guilty Monday to state murder and terror charges in a New York City court. Gene Borrello, a former organized crime associate who spent time in the unit where Mangione is behind held,

Most young adults believe discontent with the nation’s health insurance system and the killer of UnitedHealthcare CEO, Brian Thompson, share equal responsibility in the executive’s murder, according to a new poll.

Most Americans believe that health insurance profits and coverage denials played a role in the UnitedHealthcare CEO's shooting death on Dec. 4, a new AP-NORC poll said.