(CNN)  -- The friend who was on the phone with  Trayvon Martin when his fatal confrontation with George Zimmerman began  said Monday she is "disappointed, upset, angry, questioning and mad" at  Zimmerman's acquittal on murder charges.    Rachel Jeantel called the verdict "BS" and said Martin, 17, was never aggressive.   "He was a calm, chill,  loving person who loved his family, definitely his mother, and a good  friend," Jeantel told CNN's "Piers Morgan Live."   Zimmerman, a neighborhood  watch volunteer in Sanford, Florida, was acquitted Saturday of  second-degree murder charges in Martin's death. The killing sparked  protests when police declined to bring charges against Zimmerman,  leading to the appointment of a special prosecutor who eventually took  the case to court.   Prosecutors had argued that Zimmerman, who is Hispanic, had profiled and pursued the African-American teen.   Juror: 'No doubt' that Zimmerman fea...