scene. >> reporter: she was shopping with her mother when she was killed. she died with a gunshot wound to the chest. the medical examiner listing her death a homicide. police describe the suspect's earlier movements and reese leased closed-circuit video from the store. >> the suspect smashed a computer monitor nearby. he hits the glass railing, he took the escalator down and encountered another female. he attempted to take her bag. the suspect tackled her and hit her with the lock. >> reporter: the california department of justice are now investigating the officer-involved shooting. and valentina's family mourning the loss of the young girl, killed while out shopping, just two days before christmas. now, poppy, one major question raised by this new video is whether an officer with a high powered assault rifle should have considered what was beyond his target, before opening fire. that is under investigation. but one thing is clear from this new body camera footage, this