Grantham has been in jail since June 18, 2003.
After his release, Grantham would be turned over to federal authorities, who have filed a parole violation charge against him, said Berkeley County Prosecutor Pamela Games-Neely.
Grantham was on federal parole at the time of the shooting.
On Oct. 31, 2002, U.S. District Court Judge W. Craig Broadwater ordered Grantham to serve three years of supervised release. As terms of his release, Grantham was not allowed to carry a gun or commit any crimes, according to federal court records.
The parole stemmed from a guilty plea Grantham entered in April 2000 to one felony count of distribution of crack cocaine.
Grantham's attorney, Kevin Mills, said after Wednesday's hearing that an agreement was reached with federal authorities on the parole violation charge. He declined to release details, but said the agreement should enable Grantham to be freed from prison in a year or less.
Games-Neely said after the hearing that pleading the charge of murder down to voluntary manslaughter is appropriate.
Two of Grantham's family members - his mother and his girlfriend - were shot by Redman during a struggle, she said.
"That's a very strong self-defense argument," she said, adding that some witnesses changed their stories or refused to testify.
Also, she said, Redman was well-known within the court system.
Before Wednesday's hearing began, an Eastern Regional Jail corrections officer handed Mills two envelopes that contained Redman's jail records. Wilkes said he had had quite a bit of contact with Redman through the court system.
"It's the state's view that this is a voluntary manslaughter case," Games-Neely said.
Wilkes said he did not want to immediately accept the plea bargain because a probation officer had not recommended it or spoken to Redman's family.
He said he wants to know why the state was decreasing a first-degree murder charge to voluntary manslaughter, and adding the shortest possible prison sentence.
"I need to be comfortable with that," he said.
Wilkes said he could hold a follow-up hearing Friday or next week.
