The showrunner said that he expects the tragic twist in the USA show's July 26 episode 'Shock Wave' to blindside viewers.
"It's a pretty good way for an actor to go; not something you would see coming," Nix told TV Guide. "The impact will be felt for the rest of the show and launches Michael [Jeffrey Donovan] in a whole new direction."
Burn Notice star Sharon Gless elaborated that the death will have the biggest effect on her character Madeline Westen.
"[I] was very upset," she said. "It affects my character tremendously - almost more than anyone."
Burn Notice's sixth season currently airs in the US Thursdays at 9/8c on USA.