A few dozen people attended the event at First Unitarian Church, coming together to mourn, reflect and cope with lingering trauma from the incident.
The vigil honored 19-year-old Ethan Hillman, who was killed, and 19-year-old Jayden Ellis, who survived after being shot.
"We will carry the memory of our coworker who lost their life. We will continue praying for the one who is critically injured," said organizer Dr. Bryan Haimes.
The shooting happened on June 16. Authorities say 23-year-old John Wallace-Bey opened fire on fellow IT interns, targeting them following a workplace dispute. He was arrested the same day in Philadelphia.
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The violence prompted a massive police response and has had a lasting impact on the hospital community.
"We hold in mind those who care for others in moments of crisis, fear, injury and loss," one speaker said.
Those at the vigil emphasized the importance of community support, especially when violence occurs in places typically seen as safe.
"In a place that we feel is a secure place, like a hospital, when it happens there, unfortunately people's eyes begin to open up," said Darryl Chambers, executive director of the Center for Structural Equity.
Advocates said they hope the tragedy serves as a turning point, leading to renewed focus on both grassroots and legislative efforts to address gun violence.
"We all deserve to live and learn and play and pray and work with freedom," said Traci Murphy, executive director of the Coalition for a Safer Delaware.
Wallace-Bey faces charges of first-degree murder, attempted murder and reckless endangerment.
Authorities said he is expected to be extradited to Delaware within 30 days.