You are in a tough situation at minimum you need to let plaintiffs counsel know, but you really need an attorney did you have auto insurance or any insurance for that matter. You may be able to get some help that way or see what you can find in way of information online regarding this issue. You need to do something fast. I would do a search on the AVVO to see if an attorney in the local of the suit may help.
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First, had your lease expired or terminated before thie incident which lead to the lawsuit. If so call the plaintiffs lawyer and tell him that and mail him the proofs to all the lawyers involved. Ask them to let you out of the case once they see the proofs. If they will not call the arbitration center. They are very helpfull to Pro Se parities. Tell them your story and that you are out of the county untill the fall and ask if they can they help you file a continuance. I believe they will help you. 215-686-9590