TOPEKA, Kan. (AP) — The Kansas Supreme Court on Friday threw out a first-degree premeditated murder conviction after finding that a Grant County judge erred in refusing to give jurors the requested instructions of self-defense and involuntary manslaughter.

The court sent the case of Michael Alan Keyes back to Grant County District Court. In its ruling, the Supreme Court said whether Keyes used self-defense boils down to a "credibility question."

"Without the jury making this credibility determination, we cannot be sure that the court's failure to instruct the jury on self-defense did not affec...