CORNELIUS, N.C. -- Cornelius Police Department is mourning after losing one of their own, K9 Dag.

The police department tweeted Friday saying, "with heavy hearts we share the passing of Cornelius Police K9 Dag."

Cornelius Police did not give a reason for the death, only that the end of his watch was Friday.

Dag spent his career with Officer Queen.

According to Cornelius Today, Derek Queen was promoted within the Cornelius Police Department in August. He joined the department in 2010 and was a patrol officer and member of the Lake Enforcement Division.