Sometime between February 19 and 20, 2002, Trevor St Elmo Ashley Taylor killed Jasmine Belle.
Belle was strangled and sexually assaulted at Melverton, St George, while on her way to church.
Taylor, who had been in prison since 2003, previously pleaded not guilty to murder but guilty to manslaughter.
Mitigating today, Taylor said he “deeply regret the incident” and was “quite ashamed”.
The manslayer was before Justice Randall Worrell in the No. 5 Supreme Court.
“If it was possible for me to give my life in exchange for the deceased, I would not hesitate to do so,” Taylor said.
He also asked the court to consider the time he had already spent on remand in relation to this matter.
Taylor, who is representing himself, returns to court on March 11 for the time he had spent on remand to be presented to the court.
He is also expected to be sentenced on that date.