Devon Kareem Robinson, 19, could face life behind bars without the possibility of parole.
The law, taking effect July 1, makes Virginia the 23rd state to ban sentencing youths to life without the possibility of parole.
The decision by the Texas Court of Criminal Appeals means the death row inmate no longer has an execution date.
Carter was 17 when she convinced Conrad Roy III to stay in his car as it filled with carbon monoxide.
Prosecutors may choose to drop the case against the rapper altogether.
After being shot beside the rapper in South Los Angeles, Kerry Lathan was arrested on an alleged parole violation.
Kerry Lathan said he was at the rapper's clothing store trying to get a new shirt when shots were fired.
After the initial shock of his son's death subsided, Azim realized that there are victims on both sides of the gun.
A new report from the Abolitionist Law Center "presents a definitive portrait of a punishment that is archaic, cruel, unjustified, and indefensible,” its co-author says.
She says no one ever told her she was ineligible to vote because of a felony offense.