UnitedHealthcare CEO’s killing shows why companies spend millions to protect their top executives

United Healthcare CEO Brian Thompson had an in-house security detail attached to him during his trip to New York City, according to a source, but the detail wasn’t with him when he was shot and killed Wednesday morning.

​ United Healthcare CEO Brian Thompson had an in-house security detail attached to him during his trip to New York City, according to a source, but the detail wasn’t with him when he was shot and killed Wednesday morning. Read More Breaking News, Latest News and Videos | CNN