Police have arrested a New York City teacher's aide for the stabbing death of 28-year-old Katie Suarez. Officials have charged 27-year-old Sayed Mohassib with second degree murder, after they say he stabbed Suarez in the neck while she was running along the popular Brooklyn waterfront.  Shockingly, Mohassib currently works as a teacher’s aide at a nearby elementary school and briefly worked for the NYPD before being removed for psychological reasons. He was also discharged from the Marines for mental health issues, raising major questions as to how he was hired by the New York City Department of Education.