One Phone Call Led To A Sex Offender Registry Charge, Investigators Allege

PRINCE FREDERICK, Md. — A Prince Frederick man is facing a misdemeanor charge after Calvert County Sheriff’s Office investigators alleged he failed to report a cellphone number as required under Maryland’s sex offender registration law, according to court documents.

Lemuel McKinley Mackall Jr., 42, of Prince Frederick, was charged in the District Court for Calvert County with failing to provide required notification as a registered sex offender. The charge was filed July 17, 2026, through a statement of charges application.

According to the application for statement of charges, the Calvert County Sheriff’s Office was contacted on July 15 by the agency’s Sex Offender Registry Unit regarding an issue discovered during a routine address verification of Mackall, who is listed as a Tier II registered sex offender.

Court documents state civil process deputies conduct routine address verification checks to ensure information maintained by the Sex Offender Registry Unit is accurate and current. During Mackall’s verification, investigators determined that only two telephone numbers were listed in the registry records. One belonged to his sister, and the other belonged to his mother. Investigators alleged Mackall repeatedly claimed he did not possess a personal cellphone and instead used other people’s telephones.

According to charging documents, investigators reviewed Mackall’s registration history dating back to January 2015 and alleged that throughout that period he repeatedly certified on registration forms that he did not possess a personal telephone number.

Investigators later used investigative methods that allegedly confirmed Mackall was in possession of an active cellphone that had never been reported to the Sex Offender Registry Unit. Court records state deputies obtained the unreported cellphone number, and an agent with the Sex Offender Registry Unit spoke with Mackall about it. During that conversation, the officer told Mackall investigators had located a telephone number associated with his name.

According to the charging documents, Mackall initially denied the number belonged to him, claiming it was “an old number.” Investigators then called the number. Deputies alleged a cellphone began ringing from inside Mackall’s front pants pocket, contradicting his earlier statement.

Based on the investigation, Sgt. Livingston alleged Mackall knowingly failed to notify the appropriate local law enforcement agency of a change to his required registration information by failing to report his cellphone number within three days, as required by Maryland law.

Maryland Criminal Procedure Article § 11-705 requires registered sex offenders to report changes to certain registration information — including residence, employment, telephone numbers, internet identifiers and vehicle information — to the designated local law enforcement agency within three days of the change. According to the charging documents, investigators alleged Mackall failed to comply with that requirement.

A summons was issued July 17, 2026, and was served July 23, 2026.

Mackall is scheduled to appear for a preliminary inquiry on Sept. 14, 2026, in Calvert County District Court.

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