Hakobyan's 14-year-old daughter found her body in the complex's car port.
Tersargyan was arrested weeks later and charged with one count of murder with the special circumstance of lying in wait. He pleaded not guilty May 3.
In 2008, Hakobyan's 43-year-old husband Khachik Safaryan and their 8-year-old daughter Lusine were also found fatally shot in the same apartment.
Tersargyan was expected to be arraigned Wednesday, but a preliminary hearing has been postponed until Aug. 13.
AP contributed to this report.