Four Co-Defendants Plead Guilty to Gang-Related Homicides

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Four of five co-defendants pleaded guilty to two gang-related homicides and one non-fatal shooting before DC Superior Court Judge Michael Ryan on May 30.

Ronald Henderson, 19, Derricko Johnson, 21, and Daveon Robinson, 18, were originally charged with multiple counts of conspiracy, assault with intent to kill while armed, and possession of a firearm during a crime of violence.

Henderson and Johnson were additionally charged with first-degree premeditated murder and carrying a pistol without a license outside a home or business. Johnson was charged with fleeing a law enforcement officer, an offense allegedly committed during release.

Demarco Robinson, 21, was originally charged with conspiracy.

The defendants’ charges stem from their conspiracy between April 2022 and July 2023, as members of the “Get Back Gang,” to assault and kill individuals with opposing views, including members of rival gangs. The prosecution said the defendants communicated their plans in an Instagram group message.

Henderson and Johnson were involved in the fatal shooting of 16-year-old Justin Johnson and injury of two additional individuals on May 26, 2022.

Johnson was also involved in the fatal shooting of 32-year-old Clayton Marshall and injury of one additional individual on April 12, 2022.

Henderson and Daveon were involved in a non-fatal shooting that injured two individuals on Jan. 2, 2023.

The fifth co-defendant, Dionzai Parker, 21, is charged with conspiracy, first-degree premeditated while armed, three counts of possession of a firearm during a crime of violence, assault with intent to kill while armed, and two counts of carrying a gun outside a home or place of business. The charges stem from his alleged involvement in the fatal shooting of 37-year-old Brice Djembissi and injury of one additional individual on Feb. 25, 2023.

All four shootings occurred on the 2200 block of Savannah Terrace, SE.

During the hearing, Henderson, Johnson, Daveon, and Demarco accepted plea deals from the prosecution. In exchange, the prosecution dismissed all greater and remaining charges and parties agreed-upon a sentence range for each defendant.

Henderson pleaded guilty to conspiracy, second-degree murder while armed, and two counts of assault with a dangerous weapon with an agreed-upon sentence of 18-to-23 years of incarceration.

Johnson pleaded guilty to conspiracy, second-degree murder while armed, voluntary manslaughter while armed, and assault with a dangerous weapon with an agreed-upon sentence of 19-and-a-half-to-23 years of incarceration.

Daveon pleaded guilty to conspiracy and two counts of assault with a dangerous weapon with an agreed-upon sentence of six-to-10 years of incarceration.

Demarco pleaded guilty to conspiracy with an agreed-upon sentence not exceeding and concurrent with his incarceration for a separate firearms case in federal court.

The deals prohibit the four defendants from testifying about the incident on Feb. 25, 2023 or providing Parker with an alibi. A hearing for Parker’s case is scheduled for July 16.

Marshall’s mother spoke at the hearing and asked Judge Ryan to impose the maximum sentence on the defendants for her son who was “brutally murdered” in a “senseless tragedy.” She emphasized the defendants will return home after their incarceration but said, “My son Clayton will never get to come home.”

Judge Ryan accepted the guilty pleas and granted requests from defense attorneys for the defendants to complete high school prior to their sentencing.

Henderson and Johnson’s sentencing is scheduled for Sept. 12, Daveon’s sentencing is scheduled for Nov. 21, and Demarco’s sentencing is scheduled for Jan. 9, 2026.