 To Kettering, music teacher resigns after pleading not guilty to child porn charges. Police say they found child pornography on 37-year-old Matthew Kohler's phone after a teen said Kohler exchanged sexual texts with him when he was a middle school student and Kohler was the choir director at Kettering and Van Buren Middle Schools. WHIO's Will Taylor reporting Kohler has been on unpaid leave since November.