The Nebraska Supreme Court has affirmed the conviction and life sentence of a 24-year-old state prison inmate for the stabbing death of a fellow prisoner.

Mohamed Abdulkadir was sentenced last fall for the June 2011 stabbing death of 22-year-old Michael Grandon at the Nebraska State Penitentiary in Lincoln.

Grandon had been imprisoned for the May 2007 murders of 38-year-old Lori Solie and her 5-year-old daughter, Tiara, of North Platte.

Abdulkadir originally was imprisoned for aiding and abetting second-degree murder and convictions on drug and robbery charges in the 2009 killing of a man in Grand Island.

On Friday, the state’s high court rejected Abdulkadir’s arguments that the trial judge should not have allowed some gruesome photographs, gave incorrect jury instructions and issued an excessive sentence.