A 36-year-old Lawrence man is facing fentanyl trafficking charges after Tewksbury Police say their investigation into a fatal overdose at a Main Street motel led directly to his arrest. Wilkin Castillo-Arias was taken into custody Monday, Sept. 14, and arraigned Tuesday in Lowell District Court, where a judge ordered him held on $5,000 cash bail.
According to the Tewksbury Police Department, the case began on September 6, when officers opened an investigation into a fatal overdose at a motel on Main Street. That inquiry culminated in Castillo-Arias being charged with trafficking more than 10 grams of fentanyl and possession with intent to distribute a Class B substance. His arrest on Monday, September 14, drew support from several neighboring agencies, including the Middlesex Sheriff's Office, Burlington Police, Andover Police, and Billerica Police, the department said.
U.S. Immigration and Customs Enforcement has also placed a detainer on Castillo-Arias, per the department's account. Under the Massachusetts Supreme Judicial Court's 2017 ruling in Lunn v. Commonwealth, state and local police lack the statutory authority to hold a suspect solely on a civil ICE detainer once the grounds for state custody expire, a legal backdrop that could shape what happens once his state case concludes.
Why an Overdose Death Became a Trafficking Case
Massachusetts' Good Samaritan Law, codified at M.G.L. c. 94C, § 34A, shields people who call for help during an overdose from personal drug possession charges, but the statute explicitly does not protect sellers from distribution or trafficking prosecution, according to Boston Drug Treatment Centers. That legal distinction helps explain why a fatal overdose call turned into a full trafficking investigation rather than ending with the case closed.
Tewksbury Police Chief Ryan Columbus said he was extremely proud of the work that led to the arrest, and that those who sell drugs must be held accountable. Columbus added that the department will pursue every investigative lead when an overdose claims a life, a statement that underscores how the case moved from a death investigation to felony charges.
Fentanyl Trafficking Carries Steep Penalties
Under Massachusetts General Law Chapter 94C, Section 32E, trafficking 10 grams or more of fentanyl is classified as a felony carrying a potential state prison sentence of up to 20 years, according to Justia Law. Castillo-Arias faces the charges described above.
The Tewksbury case fits a broader pattern documented in the Merrimack Valley, where federal and state agencies, including the Massachusetts Attorney General's Office and the U.S. Attorney's Office, have repeatedly identified Lawrence as a primary hub for fentanyl trafficking supplying the region and broader New England, per Mass.gov. A January 2025 law enforcement operation in Lawrence resulted in the seizure of over 4.25 kilograms of fentanyl, an earlier Lawrence bust that reflected the ongoing presence of high-volume synthetic opioids moving through the corridor.
Main Street motels in Tewksbury have drawn law enforcement attention before. In December 2021, a multi-agency raid at a Main Street motel yielded 400 grams of seized fentanyl, according to WHDH 7News. The Middlesex Sheriff's Office was among the neighboring agencies involved in the arrest.
Statewide Overdose Deaths Have Fallen Sharply
The case comes amid a notable statewide shift in the opioid crisis. Preliminary data released by the Massachusetts Department of Public Health in June showed that annual opioid-related overdose deaths in Massachusetts fell below 1,000, to an estimated 978 deaths in 2025, for the first time in over a decade, according to Mass.gov. That figure marks a nearly 60 percent decline from the state's record high of 2,364 overdose deaths in 2022, as reported by GBH.
Separately, Massachusetts recorded 1,667 drug-overdose deaths in 2024, according to a state report. Even as statewide numbers trend downward, the fatal overdose in Tewksbury shows how individual deaths continue to drive local trafficking prosecutions.
How to Report Suspected Drug Activity
Residents with concerns about suspected drug activity should contact the Tewksbury Police Department through its official channels. Anyone with a medical emergency should call 911.
