<P> Rachel Marron (Whitney Houston) is an Academy Award - nominated music superstar who is being stalked and sent death threats . Things get dangerously out of hand when a bomb disguised as a doll explodes in her dressing room . Rachel's manager, Bill Devaney (Bill Cobbs), seeks the services of a professional bodyguard, Frank Farmer (Kevin Costner), to protect her . He is a highly successful private bodyguard, mostly protecting corporate VIPs . Formerly he was a Secret Service agent who served as part of the presidential protection detail during two presidencies . Frank is reluctant to accept the offer to guard Rachel as he sees her as a spoiled diva who is oblivious to the threats against her life . </P> <P> Frank's concerns are quickly realized when Rachel looks upon Frank as being paranoid and his extensive protection techniques as intrusive . Rachel's existing bodyguard Tony (Mike Starr) resents Frank's presence . But at a concert where Rachel is performing, a riot breaks out and Frank rescues her from danger . As a result, the two develop a closer relationship . Frank tries to remain professional, but the two sleep together . However, recognizing that this compromises his ability to protect his client, Frank breaks off their affair . Hurt, Rachel begins to defy Frank's painstaking security measures . She even goes as far as attempting to sleep with his former Secret Service colleague Greg Portman (Tomas Arana). But after she has personal contact with her stalker via a threatening phone call, Rachel realizes that she must put her trust in Frank ahead of her own desire for personal gratification . She finally recognizes the seriousness of the situation and cancels the rest of her tour . </P> <P> Frank, Rachel, Rachel's driver Henry (Christopher Birt), Rachel's son Fletcher (DeVaughn Nixon), and her sister Nicki (Michele Lamar Richards) then travel to a large lakefront cabin in the mountains, the home of Frank's father, Herb (Ralph Waite). The next day, Fletcher is almost killed when a bomb explodes inside the boat he rode moments before . After finding footprints around the cabin and sabotaged automobiles, Frank realizes that Rachel's stalker has followed them . After securing the house for the night, Frank learns that Rachel's obsessive stalker and the person trying to kill her are not the same person . Angry and drunk, Nicki admits that during a drug - induced fit of jealousy she hired a hitman to kill Rachel, but that the letters from the stalker came before that . However, she cannot call it off because she does not know the killer's identity . </P> <P> Abruptly, the hitman breaks into the house and fatally shoots Nicki . Frank, who is armed with a semi-automatic pistol, ensures that his father has secured the rest of the group on the second floor . Upon tracking the killer and then pursuing him into the woods, Frank shoots but misses, allowing the shooter to escape capture . Frank learns the next day, from his Secret Service contacts, that they have apprehended the stalker and were interviewing him when Nicki was shot . </P>

Who plays rachel's sister in the bodyguard