Story highlights Firefighter John Ulmschneider was trying to force a door open when gunfire erupted, authorities said

A second firefighter was wounded but is expected to survive

(CNN) A man who shot two Maryland firefighters -- one of them fatally -- was released from custody without any charges, police said Saturday.

"Yes, he was released from custody and as far as why charges have not been filed, call the state's attorney office," Prince George's County Police spokesman Tyler Hunter said.

Efforts to reach the state's attorney for comment Saturday night were unsuccessful.

The shooting happened Friday night at the man's residence in Temple Hills, in the Washington, D.C., suburbs after his brother called "expressing concern," the police department said in a statement.

Specifics on the call were unclear, but authorities said it was medically related.

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