Erin Piacenti, 32, was fatally stabbed by Pamela Cisneros on Aug. 31 while leaving her job at Bank of America

She had just welcomed her first child, a baby daughter, five months prior and was leaving work after her first day back from maternity leave when she was killed

Tak Kam, 68, was also stabbed but is expected to recover, and police later used lethal force on Cisneros when she charged at them with two knives in her hands