Generally one must file suit within the statute of limitations.
A statute of limitations is a law which places a time limit on pursuing a legal remedy in relation to wrongful conduct. After the expiration of the statutory period, unless a legal exception applies, the injured person loses the right to file a lawsuit seeking money damages or other relief
The time limitation for medical malpractice in OK is 2 years.
However, the statute of limitations can be extended at times because of the "discovery rule".
Sometimes it is not reasonably possible for a person to discover the cause of an injury, or even to know that an injury has occurred, until considerably after the act which causes the injury. For example, an error in the drafting of a will might not be noticed until the will is being executed, decades after it was drafted, or a financial planner's embezzlement might not be noticed for years due to the issuance of false statements of account. Or in your case, the loss of memory or amnesia of the event precludes one from knowing who, what, when, or how they were injured.
When it applies, the "discovery rule" permits a suit to be filed within a certain period of time after the injury is discovered, or reasonably should have been discovered. The discovery rule does not apply to all civil injuries, and sometimes the period of time for bringing a claim post-discovery can be short.
But in your case I believe you are still within the statute of limitations if he would file within 2 years after realizing the what, when, who, and how of his injury.
It would appear clear that his action would still be within the statute of limitations.
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