Who pays when a parked car is hit by another car that was hit for a running away car?

I believe you are saying one care is parked and is hit by another car that leaves the scene of the accident. If your vehicle has uninsured motorist coverage then the UM coverage will pay to repair your vehicle less your deductible. If later a witness or the offender turns himself in and your company had already paid, the other party will reimburse the insurance company and they will reimburse you for your deductible.