Hamilton police have arrested one suspect in the Saturday shooting death of Yosif Al-Hasnawi, and are searching for a second man they say is armed and dangerous. Yosif Al-Hasnawi, 19, was shot and killed near a mosque in Hamilton's central lower city on Saturday evening. Police have arrested and charged James Anthony Robert Matheson, 20, with being an accessory after the fact to murder. Homicide detectives found him at a downtown home at 3:30 a.m. ET Monday.  Paramedic service will investigate after witnesses question treatment of Yosif Al-Hasnawi Hamilton man, 19, fatally shot after trying to help a stranger in a confrontation Police also released an image of the second suspect — Dale Burningsky King, 19, of Hamilton — who is wanted for second-degree murder. King is described as a white male in his 20s with a medium to darker complexion, black hair and a medium build. His hair was long, in a ponytail wrapped at the top of his head at the time of the incident. He was wearing a hood, backpack and jeans. Anyone who sees King should call 911 and not approach him, police said.  Police are urging him to turn himself in. "I'm confident he's aware of his status," said  Det. Sgt. Steve Bereziuk at a Monday afternoon news conference outside police headquarters. Yosif Al-Hasnawi, 19, was shot and killed in Hamilton on Saturday evening. (Al-Mostafa Islamic Centre) 'I can't breathe'  Al-Hasnawi, a Brock University medical sciences student, was shot just after 9 p.m. Saturday, while on a break from a religious celebration at the Al-Mostafa Islamic Centre on Main Street East. Outside with his younger brother, he noticed two people "accosting" an older man, police said. Al-Hasnawi called out for them to stop, attracting their attention. The suspects crossed Main Street "where they then had an interaction," with Al-Hasnawi and "then took off," east toward Sanford Street.  Al-Hasnawi was shot near Main and Sanford, Bereziuk said.  Police are also looking for the older man too. Witnesses have been critical of the paramedics.  Paramedics seemed to believe Al-Hasnawi had been shot with a pellet gun, some witnesses said. 'I'm confident he's aware of his status,' Det. Sgt.