The stakes are high in 24, which means the chances of a character dying are increased, but that doesn't lessen the pain or shock value of a few key character deaths. 24 follows Counter Terrorist Unit (CTU) agent, Jack Bauer (Kiefer Sutherland), as he works alongside his colleagues to protect the country from terrorist attacks. Audiences enjoy 24 for its use of twists and realistic action. This realism is due to 24's real-time format, in which episodes take place over an hour. This method of storytelling led to audiences becoming highly invested in each character.

https://screenrant.com/24-character-deaths-sad/