Luigi Mangione, 26, was arrested in connection with UnitedHealthcare CEO Brian Thompson's killing after a McDonald's employee in Pennsylvania called police.

Luigi Mangione, who was detained at a McDonald's in Altoona, Pa., has been identified as the suspect believed to have shot and killed UnitedHealthcare CEO Brian Thompson last Wednesday in New York City.

In an entry in the notebook dated Aug. 15, Mangione allegedly wrote he “was glad” that he procrastinated in his preparations because it “allowed him to learn more” about UHC.

In a small town like Jewell, Iowa, your success is the community's success. Brian came from humble beginnings and worked his way to the top.

This image provided by the New York City Police Department shows a man wanted for questioning in connection to the investigation of the killing of UnitedHealthcare CEO Brian Thompson outside a Manhattan hotel, Wednesday, Dec. 4, 2024. (New York City Police Department via AP)

Luigi Mangione, 26, was arrested at a McDonald's in Altoona, Pennsylvania, and charged in connection with the killing of UnitedHealthcare CEO Brian Thompson.

Up to $60,000 in reward money from the FBI and the New York Police Department's Crime Stoppers program was offered for tips leading to a break in the fatal shooting of UnitedHealthcare CEO Brian Thompson.

Luigi Mangione, who has been charged in last week's murder of UnitedHealthcare CEO Brian Thompson in New York City, was taken into custody on unrelated charges in Pennsylvania earlier on Monday.

The attorney for Luigi Mangione, who has been accused of killing UnitedHealthcare CEO Brian Thompson, slammed New York City officials for what she referred to as a “staged” perp walk for her client last week.

A grinning Luigi Mangione appeared to yuk it up in a Manhattan courtroom Monday as he entered a plea in the murder of UnitedHealthcare CEO Brian Thompson.

A poll says 41 percent of those between 18 and 29 say the UnitedHealthcare CEO's killing was at least "somewhat" acceptable.