Public opinion could be an invisible force in the board's decision.
If Sirhan is released, he would be the first imprisoned political assassin to win parole in this country. James Earl Ray, convicted of killing the Rev. Martin Luther King Jr. and Jack Ruby, convicted of killing John F. Kennedy's assassin, Lee Harvey Oswald, both died in prison.
Sirhan was originally sentenced to death over objections by Kennedy family members who said they wanted no more killing. The sentence was commuted to life in prison when the U.S. Supreme Court briefly outlawed the death penalty in 1972.
Kennedy's son, Maxwell, who has spoken for the family previously, did not return phone calls from the AP regarding Sirhan.
The lawyer notes that he has a personal tie to Kennedy, having been chairman of his citizens' committee when he ran for Senate in 1964.
Pepper also represented James Earl Ray, through 10 years of appeals and a civil trial which he said proved that Ray was not King's killer. By then Ray was dead.
David Dahle, head Los Angeles deputy district attorney for parole candidates serving life sentences, said his remarks at the hearing will depend on what is presented by the defense.
"At this point, I am skeptical that I will see something that will cause me to not oppose the grant of parole," he said.
Few high profile prisoners have been released in the California system. Charles Manson and his followers have been repeatedly turned down for parole. Manson follower Susan Atkins attended her final parole hearing on a gurney dying of cancer but was denied release and died in prison three weeks ago.
Dahle said the board will review Sirhan's behavior in prison and whether the explosive outbursts of the young man who stood trial in 1969 have continued as he aged. By all accounts, Sirhan has been a model prisoner. But he said there will also be discussions of how he might adjust to life on the outside.
His brother, Munir Sirhan, 64, will submit a statement and a plan for Sirhan to live with him in his Pasadena home if released. However, even Pepper says that is an unlikely prospect because Sirhan, who was a Palestinian immigrant from Jordan, will be considered an illegal alien and would be turned over to immigration officials for deportation.
Munir Sirhan told The Associated Press he has made arrangements with a family in Jordan to house Sirhan if he is deported there.
"I hope it comes out in his favor," said Munir Sirhan. "As Christians we hold a lot of faith. I stand ready to help him in any way possible. If he is not deported our house is still here for him. We feel for the senator, God rest his soul. But 43 years is a long time. "
Both Pepper and Dahle said Sirhan's Middle Eastern connections have always provided a backdrop for considerations of parole.
"I don't think there will ever be a disconnect between issues of Middle East politics and this case," said Dahle.
Pepper said Sirhan is a victim of misperception because of his Palestinian Arab background. He said most assume Sirhan is a Muslim and some have referred to him as "the first terrorist." In fact, he said, Sirhan is a Christian and had no ties to terrorist groups.
Among those attending the hearing will be one of the victims. William Weisel, who was an ABC-TV director, was shot in the stomach.
"There's no doubt he was the shooter," Weisel said. "Whether or not there was another one, I don't know. If there were 13 shots, who was the other shooter?"
Having covered the White House through seven presidents, he said he does not ascribe to conspiracy theories because, "The government can't keep a secret."
However, Weisel said he will tell the parole board he has no objection to Sirhan's release "if the district attorney and the parole board decide it's to everyone's advantage."
Another surviving shooting victim, Paul Schrade, said he was not attending and would have no comment.
AP Special Correspondent Linda Deutsch covered the assassination of Sen. Robert F. Kennedy and the Sirhan trial in 1968-69.
- Top scandals and controversies of each United...
- Fly a flag for Cody: Army confirms Utah man...
- Journalists criticize Obama administration,...
- 'Star Trek: Into Darkness' does $70.6M but...
- Measles surges in UK years after flawed...
- 2 men arrested in killing over iPad in Las Vegas
- Mitt Romney talks IRS, AP records, Benghazi...
- AIG CEO tells college graduates facing...
- Mitt Romney talks IRS, AP records,... 65
- Associated Press CEO calls records... 22
- White House insists Obama was not... 22
- Journalists push back against Obama... 21
- House chairman sees IRS targeting as... 16
- Republicans try to link IRS scandal,... 12
- Tea party looks to take advantage of... 12
- President Obama walking a familiar path... 11