Troopers say Tyrone Cook missed a scheduled verification check and is no longer living at his last known address.
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The 45-year-old must register as an offender for life, but authorities are unable to locate him.
Cook was convicted of sexually assaulting a person under the age of 13 and corrupting minors back in 2019.
He has ties to Philadelphia, Chester, Pennsylvania and New Castle County, Delaware
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If you have any information on Cook's whereabouts, contact state police at 484-840-1000 or anonymously contact the Pennsylvania Crime Stoppers Toll Free at 1-800-4PA-TIPS.