LIBERTY, Mo. (AP) — The death sentence of an avowed anti-Semite who fatally shot three people at two suburban Kansas City Jewish sites in 2014 should be overturned because he was incapable of understanding the legal intricacies when he represented himself at trial and during sentencing, his attorney said Monday.

Attorney Reid Nelson also argued before the Kansas Supreme Court that Frazier Glenn Miller Jr.'s sentence should be overturned because the state's death penalty law is unconstitutionally vague. He said Miller's standby attorneys should have been allowed to intervene during the penalty...