An Essex County Prosecutor's Office spokesman says McKenith's boyfriend, 28-year-old Lewis Goosby, was shot three times and is in critical condition.
Police say Goosby escaped through a window after being wounded shortly before 4 p.m., and McKenith barricaded herself inside the apartment when officers arrived. Police entered after hearing gunshots.
Police say they believe McKenith's service weapon was used in the shootings.
McKenith had worked for the Essex County corrections office since 2005.
