jordan: sharon tate and three houseguests -- jay sebring, abigail folger, and wojciech frykowski -- haveea what's coming up the driveway. the people in that house were terrorized, tortured. ♪ dr. jordan: charles manson may not have been there, but he had given them very specific instructions, "before you leave, leave a sign." susan atkins picks up a towel and dips it in the blood of sharon tate, and on the front door of the house writes the word, "pig." reporter: in a scene described by one investigator as reminiscent of a weird religious rite, five persons including actress sharon tate, were found dead. sidner: incredibly, 19-year-old william garretson, the fill-in caretaker, had been just 25 yards away, in the guesthouse, when these five people were murdered the night before. wiehl: the police take william garretson into custody, and he becomes suspect number one. shelley: as l.a. homicide detectives are looking, one of the strangest things was a statement written in blood. on the front door, they saw the word "pig." sidner: but why is it written here, on sharon tate's front door? poli