NEW : A district attorney says marks on Leiby Kletzky 's wrists indicate he was tied . The Associated Press contributed to this report. Levi Aron is hospitalized while doctors evaluate his mental state , prosecutors say . An indictment says 8-year-old Kletzky was killed in Aron 's apartment . His only known criminal summons was for urinating in public last year . The charges against Aron carry a maximum sentence of life without parole .
NEW : A district attorney says marks on Leiby Kletzky 's wrists indicate he was tied . The Associated Press contributed to this report. Levi Aron is hospitalized while doctors evaluate his mental state , prosecutors say . An indictment says 8-year-old Kletzky was killed in Aron 's apartment . The charges against Aron carry a maximum sentence of life without parole .