TOPEKA, Kan. (AP) — The Kansas Supreme Court is preparing to hear an appeal from a Topeka man who is serving a “hard 50” prison sentence in another man’s shooting death.

Trevejon Maurice Killings insisted he wasn’t guilty when he was sentenced in 2011 to at least 50 years in prison with no chance of parole for the 2010 death of 24-year-old Antonio Jackson. Jackson was shot at a Topeka apartment while several other people, including a child, were present.

The Topeka Capital-Journal reports that Killings is appealing his conviction for first-degree murder and his sentence. Issues raised in the appeal include claims that the judge erred when she didn’t instruct jurors about lesser included offenses to the murder count.

The case goes before the high court Tuesday.