My friend's daughter and another girl were jogging about 3 miles away from where the woman was shot at Home Depot in Fairfax. A bicycle rider with a rifle stock sticking out of his backpack passed them by. They stopped cold and stared at him. They called police and gave a full description. Shortly after the woman was shot. This could well be the guy and that means the police can create a full description.
I don't think it was her daughter. I think she said it was her friend's daughter who was with a friend. (Third hand report)