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Police Announce Arrest of Attempted Murder SuspectARLINGTON, Va. – The Arlington County Police Department is announcing the arrest of a Maryland man following a month’s long criminal investigation. Colin Demarco, 26, of Rockville, MD is charged with Attempted Murder, Criminal Solicitation to Commit Murder, Carrying a Concealed Weapon and Wearing a Mask in Public to Conceal Identity. He was taken into custody at his residence on January 16 and later extradited to the Commonwealth of Virginia. He is being held without bond in the Arlington County Detention Facility. At approximately 3:15 p.m. on August 10, 2025, Arlington County Police were dispatched to the 3800 block of 7th Street S. for the report of a suspicious person. A witness reported observing a male suspect, who was wearing a surgical mask and rubber gloves, carrying a backpack and appeared to be concealing a firearm under his shirt, on the victim’s porch. The suspect subsequently approached the witness and inquired about the victim before leaving the scene. The witness then contacted police and responding officers established a perimeter and canvassed the area for the suspect with negative results. The incident was captured on home surveillance video and the suspect was subsequently identified. During the course of the investigation, the Arlington County Police Department executed search warrants for digital records associated with the suspect. As a result of these search warrants, police recovered digital evidence that the suspect had obtained directions to the victim’s residence, had information detailing locations of firearms possessed by a relative and had a guide detailing tips to prevent criminal detection. Additionally, the suspect had posted online about the victim and had online discussions appearing to solicit others to murder the victim. Within days of these online solicitations, the August 10 incident occurred where the suspect arrived at the victim’s address wearing a mask and gloves, possibly concealing a firearm and inquired about the victim. As a result of the investigation, detectives obtained the criminal warrants for the suspect’s arrest. This remains an active investigation and anyone with information that may assist the investigation is asked to contact the Arlington County Police Department’s Tip Line at 703-228-4180 or ACPDTipline@arlingtonva.us. Information may also be reported anonymously through the Arlington County Crime Solvers hotline at 1-866-411-TIPS (8477).  Booking photograph of Colin Demarco
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