Dylan Lane Sullivan, 22, of Lexington Park
Dylan Lane Sullivan, 22, of Lexington Park, was arrested July 21, 2026, on three firearm charges after investigators said photographs and video showed him holding and firing a semiautomatic handgun while he was prohibited from possessing firearms.
Sullivan is charged with illegal possession of a regulated firearm, carrying a loaded handgun on his person and carrying a handgun on his person. An arrest warrant was issued July 20, 2026, and served shortly after midnight the following day on West Baldridge Street in Leonardtown.
He has remained held without bond. At his initial appearance, a commissioner found there was a reasonable likelihood Sullivan posed a danger to another person or the community. A judge continued the no-bond status after a July 22, 2026, bail review.
On July 25, 2025, Circuit Court Judge Joseph Michael Stanalonis sentenced Sullivan to three years in jail after he pleaded guilty to possessing a rapid-fire activator. The judge suspended all but 186 days of the sentence and placed Sullivan on three years of supervised probation.
The sentence did not require Sullivan to serve the full three years at that time. Two years and 179 days were suspended and could potentially be imposed later if a court found that he violated probation.
The available information does not show Sullivan’s exact release date, how much credit he received for time already spent in custody or precisely how many days he remained jailed after sentencing. It also does not include the complete terms of any plea agreement or indicate whether prosecutors recommended the sentence.
Judge Stanalonis imposed the sentence after Sullivan pleaded guilty to one charge. The available case information does not explain why the remaining charges did not result in additional convictions or how each was formally resolved.
Dylan Lane Sullivan (2025 Booking Photo)
Myrtle Point Beach Investigation Led Investigators to Phone Evidence
The current case grew out of an investigation that began after deputies with the St. Mary’s County Sheriff’s Office responded to Myrtle Point Beach in April 2026 for a reported shooting.
During that investigation, deputies developed a suspect and later executed a search warrant at that suspect’s residence. Investigators seized the suspect’s cellphone and obtained a separate warrant to extract and review the phone’s data.
While examining the phone, Detective Forinash reportedly found a photograph and video that allegedly showed Sullivan possessing a semiautomatic handgun. Those images became part of the basis for the new firearm charges.
The filings do not identify the suspect in the Myrtle Point Beach shooting and do not state that Sullivan was that suspect.
Cpl. Michael Labanowski wrote that he knew Sullivan was prohibited from possessing firearms and ammunition because of the 2025 rapid-fire activator conviction and his continuing supervised probation.
Investigators said the photograph recovered from the phone was created March 7, 2026, at about 11:46 a.m. The image allegedly showed Sullivan holding a black semiautomatic handgun inside a garage. A garage-door opener, ceiling tracks and storage boxes were visible in the background.
Labanowski said he recognized the garage as part of Sullivan’s home on Matthews Drive in Lexington Park because he had been inside the property during an earlier weapons investigation.
The officer also referred to evidence from a 2024 investigation that allegedly showed Sullivan was involved in illegally transferring and hiding firearms for a group identified as the “V” criminal organization. The current charges do not accuse Sullivan of being a member of that organization.
Investigators also reported finding a video created March 16, 2026, at about 2:08 p.m. The video allegedly showed Sullivan outside during daylight hours firing a black semiautomatic handgun with an extended magazine.
Another person in the recording was allegedly holding a semiautomatic handgun with a silver-colored slide. Investigators said Sullivan handed his handgun to that person, who then fired it, while Sullivan held the other person’s firearm.
A school bus was parked behind them, and the two people appeared to be firing toward a red shed with a sign mounted to the right of its door, according to the filing. A dirt road could also be seen behind the shed.
On June 26, 2026, Labanowski searched the area near Sullivan’s home and reported finding a school bus and red shed at a property on Three Notch Road in Lexington Park. He said the shed, sign and nearby dirt driveway matched the setting shown in the video.
Sullivan and another person were reportedly standing outside a garage on the property when the officer drove past. Labanowski wrote that the observations allowed him to confirm that Sullivan allegedly possessed and discharged a firearm there on March 16, 2026.
The formal charges list March 7, 2026, as the offense date for all three counts, while the investigative narrative says the shooting video was created March 16, 2026.
Earlier Search Found Guns, Conversion Device and Suspected Cocaine
Sullivan’s earlier case began January 23, 2025, when members of the St. Mary’s County Sheriff’s Office Criminal Investigations Division, assisted by the Calvert County Sheriff’s Office Special Operations Team, searched his Matthews Drive residence.
The search warrant had been reviewed and signed the previous day by Judge Stanalonis.
Investigators reported finding a .40-caliber semiautomatic handgun hidden inside one of Sullivan’s dirt bikes.
Inside a second dirt bike, deputies allegedly found a loaded gun magazine, a Glock 10mm slide fitted with a machine-gun conversion device, one 10mm round and a small plastic bag containing suspected cocaine.
The conversion device, also known as a switch or rapid-fire activator, can make a semiautomatic handgun fire automatically, according to the filing.
Deputies also reported finding an empty Glock 10mm magazine in Sullivan’s bedroom. In a neighboring bedroom, investigators allegedly located a Polymer80 10mm handgun frame and a loaded 33-round magazine hidden inside a closet.
After Sullivan was advised of his rights, he allegedly admitted that he owned both firearms and had illegally purchased the machine-gun conversion device from someone in Washington, D.C.
Investigators said a law-enforcement database check showed the firearms were not registered in Maryland and that the weapon considered a machine gun had not been properly registered.
Sullivan was initially charged with receiving a detachable magazine capable of holding more than 10 rounds, possessing a rapid-fire activator, possessing a machine gun for an aggressive purpose, failing to maintain a required machine-gun registration record and possessing cocaine.
The District Court case was transferred to St. Mary’s County Circuit Court. Sullivan later pleaded guilty to the rapid-fire activator charge, and the scheduled jury trial was canceled.
Attorney Rudolf Ambrose Carrico represented Sullivan in the 2025 prosecution and entered an appearance in the new case on July 24, 2026. He filed a request for a speedy trial and a demand for access to evidence held by prosecutors.
