At the time, Atkins' had several people come and speak on her behalf, including her brother Steven Atkins and a former co-inmate. One supporter even called her "almost the perfect candidate" for compassionate release.
But their comments were followed by an outpouring of grief, anguish and anger from the relatives of her victims.
In a letter read to the board Janet Parent Prier, the sister of teenage victim Steven Parent who was shot in the Tate driveway, said Atkins "was and still is one of the most dangerous and callous murderers of the Manson girls. "
DiMaria, Sebring's nephew, also rejected the plea for compassion.
"Miss Atkins can die with dignity while serving out her sentence completely," he said. "My uncle died with dignity in the worst possible situation as he defended himself and the people he cared about as he was shot, stabbed and beaten to death by Susan Atkins and her accomplices."
And in a letter, Tate' sister Debra called Atkins "a cold blooded woman who to this day has not displayed any true remorse for her participation in the murders."
The Tate family has been very active in the parole process over the last 40 years. After the deaths of her parents and sister, Debra Tate has taken over the family cause and appears, either in person or through a written statement, at nearly every Manson-related parole hearing.
DiMaria said the seemingly endless string of paroles is exhausting for the victims' families, who get in touch every so often before a hearing.
"You're never really allowed to kind of let it go," he said. "You want to say all the things you feel need to be said, but it's such an impossibility."
While Atkins initially confessed to stabbing Tate herself, later accounts by other participants indicated she held Tate down while Watson killed her.
Atkins has said she was susceptible to the Manson cult, known as the Family, after a childhood marred by sexual abuse, low self-esteem, her father's drinking problems and her mother's death at a young age.
While Atkins did not speak in 2008, she told the parole hearing panel in 2005 that she hoped the family members of her victims would one day be able to heal and that she no longer asks for forgiveness because "I don't think that's possible."
Yet a short time later Atkins noted that "forgiveness and restoration and reconciliation means healing. And that's what I'm asking for today, for everybody in this room."
If Atkins is denied parole, she will not be eligible again for another 3 to 15 years, a length of time to be determined by the panel. If she is found suitable for parole it is a recommendation only, which will be later reviewed by the parole board and the governor.
Former Los Angeles prosecutor turned author Vincent Bugliosi -- who put Manson and his followers behind bars and penned "Helter Skelter," the best-selling account of the crimes -- told ABCNews.com last month that Atkins is the only one of the group that he might accept parole for.
"She's not going anywhere," he said. "The mercy we'd be giving her is so minimal."
Bugliosi said he is not an advocate for her release, but believes that Atkins' freedom would mean little opportunity for her besides death outside a prison.