BALTIMORE COUNTY, Md. (WJZ) — A Baltimore County police officer died earlier this week after battling an unspecified illness, officials said Friday.

Police Officer First Class Byrnes joined the department in 2004. Prior to that, he served in the U.S. Marine Corp.

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The department said Byrnes had been battling the illness “for some time.” They did not share the nature of the illness for privacy reasons.