Rayguon Brown, a 29-year-old resident of Canton, was arraigned Monday morning at the Cambridge District Court and charged with the murder of Xavier Bautista in Cambridge on July 4. Brown was also charged with “carrying a firearm without a license, being an armed career criminal and conspiring to commit murder.”

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According to an autopsy, Bautista died from two gunshot wounds, Middlesex County District Attorney Marian Ryan and acting Cambridge Police Commissioner Pauline Wells said in a statement.

The statement said Bautista left home at around 4:00 a.m. and was wearing navy-blue Cambridge Department of Public Works work attire. Video footage show he was “confronted by multiple men wearing masks who shot and killed him. The parties and the defendant then fled the scene in a white Dodge Ram pickup truck.”

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The statement said Brown acted as a lookout and was a potential backup, holding an object the police said appeared to be a firearm and at one point holding it out “as if aiming it.”

The statement said there was no known connection between Bautista and the defendant, and the motive was still being investigated.

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This is a breaking news story and will be updated.