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HOUSTON -- The reward for a Texas "10 Most Wanted Sex Offender" has been increased to $13,000 for information leading to his capture if the tip comes in during the month of August.

John Arthur Volker, 50, this month's featured fugitive, is wanted for probation violation.

He has ties to several cities in the Houston area, including Splendora, Spring, Conroe, Humble and Houston. He has also previously resided in southern California, near Los Angeles and San Diego.

Volker's criminal history includes "indecency with a child-sexual contact, involving two young girls," according to the Texas Departmen of Public Safety.

Volker is 5 feet 11 inches tall and weighs approximately 165 pounds. He has been known to work in restoration jobs.

For more information about Volker click here to view his wanted bulletin.

Call the Crime Stoppers hotline at 1-800-252-TIPS (8477) to submit an anonymous tip.

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