I am not a OK criminal attorney - but I feel confident that in every state it is illegal for someone to sign your name without permission. I am a California attorney - so I advise you to consult with a local OK criminal attorney if there is a criminal matter pending (many do not charge for an initial consultation)
This is not intended to be legal advise or as legal representation. I am a California personal injury attorney . Be aware that every state has its own statute of limitations; and statutes & case laws that govern the handling of these matters.