(CNN) -- Patricia Krenwinkel, a Charles Manson follower who went on a string of murders more than 40 years ago, was once again denied parole on Thursday, California prison officials said.
Krenwinkel, 63, was convicted of seven counts of first-degree murder for her involvement in the 1969 killing spree.
Thursday was the 13th time she had been in front of the parole board, and she is up for parole review again in seven years.
Krenwinkel was initially sentenced to death in the slayings. But her sentences were automatically commuted to life in prison when the Supreme Court briefly struck down the nation's death penalty laws in 1972.
One of the people murdered was actress Sharon Tate, who was eight months pregnant.
Tate's sister, Debra Tate, was at the hearing and said Krenwinkel has never written a letter of apology to her family and the only time she hears Krenwinkel express remorse about the killings is during her parole hearings.
"I don't buy it. I personally don't buy it," said Tate, as she stared at the gray-haired inmate. "I want to believe the human condition is capable of change. I believe in the possibility of reform. But I know what I am looking at, and I don't see it here."
Krenwinkel spoke tearfully during the hearing.
"I'm just haunted each and every day by the unending suffering my participation in murder has caused the family and friends of my victims. The enormity of the grief I caused fills me with intense sorrow," she said.
Seven people were killed during the two-day rampage by Krenwinkel and other followers of Manson in August 1969. The crew led by Manson's call to create an apocalyptic race war inflicted 169 stab wounds and seven .22-caliber gunshot wounds on the victims.