It was a killing born of pride, provoked by a smirk. Derryck Decuir, 26, of Washington, D.C., was found guilty on May 2, 2019, of second-degree murder while armed in the June 2015 execution-style shooting of 15-year-old Ballou High School student Malek Mercer. The verdict, delivered in Superior Court after two prior mistrials, marks the end of a four-year legal battle over a senseless act of street violence that left a family shattered and a city searching for answers.
The fatal encounter began at a bus stop near L’Enfant Square just after midnight on June 16, 2015. Decuir and Mercer didn’t know each other. But when one of Decuir’s friends mocked him for staring at the teenager’s belt, and Mercer reacted with a quiet laugh, something snapped. Ten minutes later, after riding the same bus through Southeast D.C., Decuir followed the boy off at 28th and Naylor Road, SE, drew a firearm, and shot Mercer once in the back of the neck—without a word. He fled into the night as the bleeding teen collapsed onto the grass.
Responding officers found Mercer unconscious and bleeding heavily. He was rushed to Washington Hospital Center, where he clung to life for three days before dying on June 19, 2015. Decuir was arrested the same day Mercer died, taken into custody on a warrant, and has remained behind bars ever since. The murder weapon remained hidden—until Decuir, from jail, made phone calls pressuring a friend to move the gun from his backyard. That call sealed his fate. A year later, MPD recovered the firearm, and forensic analysts with the D.C. Department of Forensic Sciences confirmed it was used in the shooting.
This was Decuir’s third trial. The first two ended in mistrials when juries deadlocked on the murder charge. But in 2017, he was already convicted of being a felon in possession of a firearm and obstruction of justice for attempting to hide the weapon. Those convictions stood even as prosecutors pushed forward, determined to hold him accountable for the killing itself. The jury this time didn’t hesitate—returning a guilty verdict after hearing the full chain of evidence, including witness testimony and forensic links.
Decuir now faces a maximum sentence of sixty years in prison. He will be sentenced by the Honorable Craig Iscoe on July 23, 2019. While no sentence can bring back Malek Mercer, prosecutors and law enforcement say the verdict sends a message: violence sparked by ego and pride will be met with relentless pursuit. U.S. Attorney Jessie K. Liu and MPD Chief Peter Newsham praised the years-long investigation, calling it a testament to persistence in the face of judicial setbacks.
The case drew support from multiple agencies, including the Metro Transit Police Department, the U.S. Marshals Service, the District of Columbia Department of Corrections, and forensic analysts whose work tied the gun to the crime. Inside the U.S. Attorney’s Office, a team of prosecutors, victim advocates, paralegals, and investigators labored for years to secure justice. Assistant U.S. Attorneys Jeffrey Nestler and Anwar Graves led the prosecution. For the family of Malek Mercer, the verdict is not closure—but it is accountability.
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Key Facts
- State: Washington DC
- Agency: DOJ USAO
- Category: Violent Crime
- Source: Official Source ↗
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