Police say Sian James, 25, fatally struck Detective Brian Stevenson in the head with a piece of concrete  during an argument Saturday in Canton over a parking space, according to The Baltimore Sun.

Sian, of Southwest Baltimore,  was charged with first-degree murder.

Stevenson, who was 37, is the first city officer to die at the hands of another since Jan. 9, 2007, when Troy Lamont Chesley Sr. was killed during a robbery while he was off duty, the Sun said.