LOUISVILLE, Ky. (WDRB) -- Police in Washington have arrested and charged a man suspected of shooting and killing an Oldham County High School teacher on a college campus last week.

The Metropolitan Police Department said Maxwell Emerson, 25, was shot and killed early Wednesday, July 5, at The Catholic University of America. 

Tuesday, the department said Jaime Maceo, also known as Jaime Macedo, 22, of Northwest, D.C., had been arrested and charged with murder in Emerson's death.

Fox 5 in Washington reported that Emerson's mother told them police notified her of the arrest and that she was "encouraged" by how fast the arrest was made, less than a week after her son's death.

Friday, the department released surveillance photos of a man believed to be connected to Emerson's death. It's unclear at this time whether or not Maceo is the man shown in those photos.

Emerson taught social studies and was the assistant wrestling coach at Oldham County High School. His family said he was in the capitol to learn at the Library of Congress Teachers Institute.

Emerson's mother told WDRB News last week her son was headed to the conference when he was robbed at gunpoint. 

It happened around 8 a.m. July 5 at The Catholic University of America. Police said an argument turned violent, and ended in gunfire. Emerson was taken to a local hospital where he died. Police also believed Emerson and the suspect knew each other.

Emerson's mother said she received a Snapchat from her son that said "Help" with jumbled letters that she couldn't make out. It was only later that she realized it said "Help, I am being robbed at gunpoint."

This story may be updated.

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