Mary Francis Knight, 51, killed in Navy Yard shooting

(WJLA) At 51 years old, Mary Knight had just recently passed three significant milestones in her life: a promotion to GS 15 at her job in cybersecurity, a new part-time job teaching at Northern Virginia Community College, and joyously seeing her daughter get married – just weeks before her life was cut short.

"I don't know...I just don't expect this. We were very happy and satisfied -- and boom," said her shocked mother, Lilly DeLorenzo, in an interview with WTVD.

"I'm having a hard time facing this thing," she finished.