Discription of Events: The woman had short straight black hair and a foreign accent that we could not place. She confronted us in the parking lot of Harris Teeter on Route 50 in Fairfax (about 8pm on a Saturday night) and said something like "Are you looking for someone? Do you need connections?" I rolled down the car window and said "No," then proceeded to pull out of the parking spot. This woman backed out at the same time as me in an effort to block my car. I proceeded to pull out more and then drove around her. She followed us closely onto Route 50 East. I turned into the left turn lane at the traffic light on Route 50 (intersection with Fair Ridge Drive) to go to the police department. She was behind us initially, then turned into the straight lane and pulled up next to us. She rolled down her window and said "Ill kill you" and some more words I could not make out, then drove straight on Route 50 East. We reported this all to the police (and I gave them my dashcam videos that have her saying "Ill kill you"). The police did detain her that night and held her for evaluation. I dont know if she is going to be charged criminally because she clearly has mental health issues. YOU MUST REPORT THIS TO THE POLICE IF IT HAPPENS TO YOU. This person should not be free to go around threatening people. She should be in a psychiatric hospital/prison.