Members of the Montgomery County Sheriff's Office and US Marshals arrived at the Garth Terrace home off Watkins Mill Road in the early-morning hours, where the 35-year-old man was approaching closely with a knife, NBC says citing officials.

“The sheriff’s deputy feared for his life and, as I mentioned earlier, had to discharge his firearm," Sheriff Darren Popkin said. 

 To read the full story on NBC Washington, click here. 

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