(Cleveland) -- Cleveland police are testing a gun they say may have been used to kill a Cleveland Clinic employee on the city's east side. There's still no word of an arrest, prompting Stephen Halton's father to call on the suspect to do the right thing and surrender.

Stephen Halton Senior was one of dozens of people who attended a vigil for his son last night on Lakeshore Boulevard. Stephen Halton, Jr. was shot and killed this past weekend at a bus stop while he waited to head into work.

Cleveland police believe the shooting was connected to a robbery.

A fund to help cover Halton's funeral expenses has been set up.

Family photo of Stephen Halton, Jr. courtesy Stephen Halton Jr. Memorial Fund

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