The suspect didn't realize Kim would suffer a stroke from the attack and die in the hospital a few days later.
Police are now handling the case as a homicide investigation and are offering a reward for information that leads to an arrest. Police don't have a lot of information about the suspect.
Kij was only able to tell family members that it was a female, possibly Hispanic, between the ages of 20 and 30 years old.
In the mean time, family members grow increasingly frustrated knowing the suspect is still out there.
"It's just really frustrating. It's something that happened that shouldn't have happened to us. There's no reason for it to happen. I just hope that we get some kind of closure pretty soon," said the victim's son Kevin Kim.
Family members said Kim had no history of health problems, and the stroke was a total surprise to them.
Anyone with information is urged to call Westminister Police at (714) 898-3315.