Missouri Court of Appeals, Eastern District / Aug 20, 2019
State of Missouri, Respondent, vs. Shawn M. Walther, Appellant.
Shawn Walther appealed his convictions for first-degree robbery and armed criminal action, arguing the trial court erred by refusing to instruct the jury on diminished capacity. Walther contended he presented sufficient evidence of a mental disease or defect and a causal link to negate his culpable mental state. The appellate court affirmed the trial court's judgment, finding that Walther failed to present substantial evidence of a statutorily defined mental disease or defect, and his actions contradicted any claim of diminished capacity regarding intent.