Tulsa County jurors imposed a 15-year sentence in December upon finding Preston Plum guilty of first-degree manslaughter in the 2007 fatal shooting of Heather Garoutte of Tulsa.

In accordance with that verdict, District Judge William Kellough sentenced Plum in January to 15 years in prison and gave him credit for the time he’d spent in custody since July 2007.

At a judicial review Friday, Kellough modified Plum’s sentence to 10 years in prison plus five years of probation.

A Department of Corrections report prepared for the review states that Plum, now 18, has demonstrated compliant behavior while in prison and completed several “faith-based” programs. Because of the nature of the crime, the report says he “does not appear to be a suitable candidate for sentence modification.”

Garoutte was shot in the head about 12:15 a.m. June 30, 2007, in the kitchen of an apartment at 1502 W. 59th St., where Plum lived.

Garoutte, identified as a friend of Plum’s, was taken to a hospital, where she was pronounced dead.

According to a report, Plum said he put a .22-caliber revolver on the kitchen table and realized that the gun’s hammer was pulled back. He indicated that when he moved to put the hammer down, the gun discharged and Garoutte fell to the floor.

Kellough indicated that Plum’s age, the impulsiveness of his conduct and the circumstances of the crime were factors he considered in deciding that a sentence modification was in the best interest of justice.

Plum maintained that the shooting was unintentional. He also said he had smoked marijuana before the shooting, according to a background report prepared after his trial.

Prosecutors originally charged Plum, then age 16, with first-degree murder.

At a preliminary hearing, he was bound over for trial on a charge of second-degree murder. He stood trial as an adult, and jurors returned a verdict on the lesser offense of first-degree manslaughter, a crime that requires a person to serve at least 85 percent of his prison sentence before being eligible for parole.