A New Jersey public school teacher who instructed her third-grade students to write “get well” letters to a convicted cop killer was fired at a raucous school board meeting that stretched into the wee hours of Wednesday morning, despite her pleas that “there’s a community behind me.” Marylin Zuniga, a first-year teacher who drew widespread condemnation for assigning her young charges the task of writing to Mumia Abu-Jamal, was canned at the meeting of the Orange Board of Education, the Star-Ledger of Newark reported.