NORTH PHILADELPHIA - A Philadelphia store owner is in extremely critical condition after police say he was shot in the head while closing his store Sunday night.Officers responded to the convenience store on the 2400 block of Ridge Avenue for a report of a shooting around 10 p.m.Police found the victim, a 50-year-old man, leaning against the front door of the store, suffering from a single gunshot wound to the head.Responding officers rushed him to the Temple Hospital where he was listed in extremely critical condition.Investigators say a family member who was inside the store at the time of the shooting told them the owner had just gone outside to close the security grate and lock up for the night.AdvertisementThe motive is unknown at this.