Jonathan Benjamin Guiliani was an 18-year-old senior at Glen Burnie High School who loved football, biking, the gym and the outdoors. Known as Jonny, he attended Arundel Christian Church, lived with his family and a cat named Oliver, and was planning to join the military before deciding between college or learning a trade.

In the early morning of Sunday, May 4, 2025, Jonathan and another person were walking along the Baltimore & Annapolis Trail in Glen Burnie around 5:00 a.m. when several masked suspects emerged from a white sedan and announced a robbery. A struggle over a handgun led to a discharge that struck Jonathan. He was found by police in the 800 block of Aquahart Road and was pronounced dead at the scene; the other victim escaped unharmed after running away.

Homicide detectives recovered 17 9mm shell casings and a laser light attachment. Using surveillance video, cellphone data and DNA evidence, detectives identified a suspect and arrested 17-year-old Mactouko Junior Ryan of Elkridge, who was charged as an adult with first-degree murder and other counts. Investigators said they were continuing to pursue additional leads and believed others were involved.

If anyone saw activity on the Baltimore & Annapolis Trail that morning or has information about the white sedan or the suspects, please come forward.