21 Killers

Anders Behring Breivik is a Norwegian domestic terrorist responsible for the 2011 attacks in Oslo and on the island of Utøya, the deadliest act of violence in Norway since World War II. His coordinated attack involved a car bombing followed by a mass shooting, resulting in 77 deaths. Breivik was arrested on the day of the attacks and later convicted of terrorism and mass murder. He received the maximum sentence under Norwegian law, with provisions allowing for indefinite extension based on continued risk.

William J. Brock became widely known after fatally shooting 61-year-old Uber driver Lo-Letha Hall outside his home in South Charleston, Ohio, on March 25, 2024. Brock had been deceived by telephone scammers into believing his family was in danger and wrongly concluded Hall was part of the scheme when she arrived to collect a package through the Uber app. A jury rejected Brock's claim of self-defense, finding that Hall was an innocent victim with no knowledge of the scam. Brock was convicted of murder in 2026 and sentenced to life imprisonment.