Michael Ainsworth / Dallas Morning News / Corbis On December 14, 2015, Philip Chism, of Danvers, Massachusetts, was convicted of raping and murdering his high-school math teacher, Colleen Ritzer. Chism, now 16, was 14 when he committed the crime, but was tried as an adult due to a Massachusetts state law requiring juveniles 14 and older accused of murder to be tried as adults.