A man on trial for the murders of an American man and his wife and daughter in Saitama Prefecture near Tokyo in 2022 on Monday pleaded not guilty, with his defense counsel arguing he was not criminally responsible due to diminished mental capacity.Jun Saito, 43, told the Saitama District Court at his first hearing, "It's not something I know about."According to the indictment, Saito killed William Bishop, a 69-year-old U.S. national, his wife Izumi Morita, 68, and their daughter Sophianna Megumi Morita, 32, on Dec. 25, 2022.Saito also allegedly set fire to Bishop's residence.Prosecutors sai…READ FULL ARTICLE