King County prosecutors say William Gardiner claimed overtime he did not work and miscoded overtime so it would count toward boosting his retirement benefit.
The 51-year-old lieutenant retired in October.
The Seattle Times reports Gardiner could not be reached Wednesday for comment. A lawyer for the Washington State Patrol Lieutenants' Association previously criticized the investigation.
State records show Gardiner was paid about $163,000 in 2010 -- more than any other patrol employee, including the chief who earned $140,000.
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