and so, he turned to two trusted friends, investigators susan mcqueen, and bill brice.er cop gave him some blunted vice about dealing with the fbi. >> i said, you need to find out what happened, if you did not do anything, you need to find out what happened, and give it to them. >> susan was confident she and bill could help him do just that. >> when all the bits and pieces came out, about the nature and which they claimed she was killed, it just did not seem possible. so you naturally look for the defense, you say this cannot be, there has to be an explanation here. >> this is not him? >> right. this would not be has nature. >> you might be not the perfect guy, but he is no killer? >> it just did not fit. >> so what do you do in the situation, as his investigators. >> we have to find out what, happened to his, research and the first goal was to get back on that bow and try to interview people, ascertain what happened and into the moments leading up to her death. >> so a couple of months after her death, they traveled to italy, and booked a cabin aboard the island escap

sidner: this hit list of stars susan atkins tells virginia about also includes singer tom jones and steve mcqueen just had to speak up. well, that broke the case. davis: information from the two separate investigations of the tate and labianca cases led detectives to the conclusion that the crimes in both cases were committed by the same group of people. shelley: susan atkins is now hauled before a grand jury. but when she took the stand, she actually denied that she stabbed sharon tate and said she held sharon tate while tex did the stabbing. nobody really knows which version is true. saying that i had killed sharon tate, i tried to take some of the blame and put it on myself because i thought that was my part. sidner: atkins also names fellow manson family members patricia krenwinkel, linda kasabian, and leslie van houten as key participants in the tate and labianca murders, all under manson's direction. what susan atkins said was so important, that the prosecution at the time made a deal with her to testify. reporter: the leader of the hippie clan, charles manson, is being returned to los ange