The man who shot himself on the steps of Memorial Church Saturday morning had published online a 1,905-page document entitled “Suicide Note,” according to his mother. The death of Mitchell L. Heisman, a 35-year-old Somerville resident, on campus was met with shock, and University officials described the incident as “tragic.” “It’s really sad, it was horrible, and these kinds of incidents affect all of us really negatively,” Dean of the College Evelynn M. Hammonds said in an interview yesterday. “This campus is situated in an urban context, and we can’t control these kinds of things.” Born in New York City...