: It is eventually revealed that Dalton Barron is the bomber, motivated by a personal grudge against Grissom for his role in "ruining" Lady Heather.
The movie provides definitive (though sometimes debated) endings for the main cast members:
: The team successfully stops Dalton before he can detonate another vest, and the case concludes with Lady Heather's name being cleared. Character Fates
: Lady Heather, a recurring enigmatic figure from the team's past, becomes a prime suspect in the bombings.
is a two-hour television movie that served as the grand finale for the original CSI: Crime Scene Investigation series. It aired on September 27, 2015, on CBS, bringing closure to a franchise that spanned 15 seasons and changed the landscape of procedural television. Plot Overview & Key Events