This was a huge moment in the series killing off Teri Bauer and really proved something to Television that 24 were willing to kill off a major character in their first season. That was very a head of its time and a negligible amount of shows would of done that in its time. This death is ranked on many lists as one of the saddest TV deaths of all time. Probably the saddest one in 24 definitely. There also is an alternate ending to this season included on the Season 1 DVD set, in which Teri lived and was not shot by Nina Myers.
Catch this episode and the entire series at Amazon Prime