(CNN) A white former University of Maryland student was convicted Wednesday of killing a black college student at a campus bus stop, prosecutors announced.

Sean Christopher Urbanski attacked US Army Lt. Richard Collins III in the early morning hours of May 20, 2017. Witnesses said he yelled bizarre comments at Collins before stabbing him in the chest, police said.

The case "was about righting an injustice," State's Attorney for Prince George's County Aisha Braveboy said at a press conference. "His life was cut short, but his legacy lives on."

Collins' father thanked prosecutors for their "fantastic job" and family and friends for support along the way.

"We are looking forward to the journey ahead because this is only the beginning," Richard Collins Jr. said.

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