Another opioid overdose trial set to begin

  • St Mary's County,Calvert County
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Mark Steven Garner II

Leonardtown, MD- A Prince Frederick man heads to court this morning, facing several charges in connection with a fatal drug overdose. Mark Steven Garner II, 29, is charged with second-degree depraved heart murder, involuntary manslaughter and reckless endangerment in connection with the death of Barbara Ann Sneden (pictured below).

Sneden, 31, was found deceased in August of 2016. The state medical examiner ruled the cause of death “heroin intoxication.” According to court documents, Sneden purchased heroin from Garner.

During the investigation, detectives from St. Mary’s County worked with the Calvert County Sheriff’s Office in an attempt to obtain additional suspect and case information. On Sept. 30, 2016, detectives from the St. Mary’s County Sheriff’s Office Vice/Narcotics Division accompanied Calvert County detectives during the execution of a search and seizure warrant in Dowell.

Police say Garner was on the scene and in possession of heroin, which was uniquely packaged. Detectives recognized this specific packaging material and technique used by the dealer of the heroin which caused the death of Sneden. Later, during an interview with police, Garner admitted he sold her the drugs.

Garner is one of eight suspected drug dealers charged with second-degree depraved heart murder by St. Mary’s County State’s Attorney Richard Fritz. So far, Fritz has been unable to obtain a conviction on the second degree murder charge—four have been acquitted on the charge, one entered an Alford plea on a lesser charge.

Garner has a criminal history dating back more than a decade to when he was 18 years old. Gardner has been charged and convicted of Controlled Dangerous Substance (CDS) possession, not marijuana, CDS possession with intent to distribute, CDS possession of marijuana, first degree burglary, CDS distribution of narcotics and third degree burglary.

He’s also facing multiple charges in Calvert County—from drug charges to conspiring to alter physical evidence of a crime process.

Judge Karen H. Abrams will preside of the scheduled four day trial.

Contact Joy Shrum at

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