Tate begged for the life of her unborn child -- a baby boy -- even reportedly asking the Family members to kidnap her and let her give birth before they murdered her. Her pleas were ignored and she was stabbed 16 times.
Shortly before the trial, when Atkins was being considered as a potential witness, Bulgiosi said she told him that she was the one who killed Tate, telling her "Look bitch, I don't have any mercy on you. You're gonna die."
But Atkins, who later rejected an offer to aid the prosecution in favor of going back to the Manson Family, would refuse to say the same thing on the witness stand during a grand jury hearing.
At a parole hearing 16 years ago, Atkins described holding Tate down while Watson stabbed her, something Watson admitted to in his 1978 autobiography.
"She asked me to let her baby live," Atkins said at the time. " I told her I didn't have mercy for her."
Crime scene photos show Tate and Sebring lying together on the living room floor, Tate's very pregnant belly exposed and covered in blood.
To this day, Bugliosi said of Atkins, "I cannot say I'm 100 percent sure that she actually stabbed anyone."
Folger, badly wounded, escaped from the house only to be run down in the front yard by Krenwinkel. She was stabbed 28 times by Watson and Krenwinkel. Reached by ABCNews.com, her brother Peter Folger, a San Francisco lawyer, said the family had no comment on the anniversary.
Frykowski who had made a last, valiant effort to protect Folger, his girlfriend, was finished off by Watson. Coroner's reports later showed that the Polish immigrant had been stabbed 51 times.
After using Tate's blood to write "Pig" on the wall, the group left, ditching their bloody clothes as they fled.
One night later, the Family was ready for its next assault.
This time Manson sent six people -- the four from the night before and two others, including Leslie Van Houten -- and rode along himself to make sure it was done correctly.
Bugliosi said Manson had been concerned that there was too much confusion during the previous night's murders.
They chose the house of grocery store executive Leno LaBianca and his wife, Rosemary. Though accounts differ from the trial and subsequent interviews and Watson's autobiography, Manson was believed to have gone into the house to tie up the victims.
Bugliosi said he believes Manson, who was only 5 feet, 2 inches tall, was able to do this despite Leno LaBianca's imposing stature by promising the couple he was only there for the money and that they would be unharmed if they cooperated.
Instead, after Manson left, Watson stabbed Leno LaBianca with a bayonet and carved the word "WAR" into his midsection. Rosemary, held bound with a lamp cord around her neck and a pillowcase over head in the bedroom, was riddled with stab wounds by Krernwinkel and Van Houten when she heard her husband screaming and began to fight back.
It was Krenwinkel, who had left a fork jutting out of Rosemary LaBianca's body, who wrote in blood the misspelled manifesto "Healter Skelter" on the wall along with phrases such as "Death to pigs" and "Rise."