A suspect in the murder of a Jewish man in Toronto last week has been arrested.

Daniel Stopnicki, 47, was walking his dog in a park in the North York neighborhood of Toronto Thursday when he was shot and killed in broad daylight. Police responding to a report about gunfire at about 12:25 p.m. found him unresponsive with multiple gunshot wounds. Police pronounced him dead at the scene after attempting lifesaving measures.

A man was arrested nearby, 67-year-old Michaelo Markicevic, an ex-cop. It’s unknown if the suspect and victim knew each other.

Markicevic has been charged with second-degree murder.

Amid a string of attacks against Jews in Toronto, some have tied the murder to antisemitism, but so far the motive of the ex-cop is unknown.

Social media tributes described Stopnicki as a technology lecturer and “one of the kindest people I knew.” One user posted: “He reached out and invited me into a WhatsApp group for people struggling with mental health. I almost said no, but I am so glad I didn’t. That group, and Dan, helped change my life in a real way. I am going to miss him so much. We need to end gun violence.”