Provincial police say a Canada-wide warrant has been issued for the arrest of a 70-year-old man in connection with the shooting death of a Caledon, Ont., businessman.

Donato Frigo, 70, was fatally shot on Sept. 13, as he and a female companion were riding horses near a wildlife conservation area in the municipality of Central Huron in southwestern Ontario.

Police say Boris Panovski of Toronto is wanted for murder and attempted murder, and that he is considered armed and dangerous.

Police have released few details about the incident but have said Frigo and the woman -- whose identity has not been released -- were taking part in dog training exercises when they were approached by a man who shot and killed Frigo.

The woman suffered minor injuries and was able to get to safety.

OPP Det. Supt. Dave Truax says the victim and accused were known to each other but would not give details on their relationship.

He had few additional details about what happened during the incident, only that "an altercation occurred."

The weekend shooting drew a heavy police presence to the quiet farming community on the outskirts of Clinton, Ont.

Police say anyone who knows Panovski's whereabouts should not attempt to confront him but should contact OPP immediately.

He's described as being five feet seven inches tall and about 200 pounds, with brown hair and blue eyes, although police say he may have changed his appearance.

Investigators also want to speak with anyone who may have interacted with the suspect in the past seven days or who may have seen his vehicle, described as a blue 1998 Toyota four-door sedan, near the Hullett Wildlife Conservation Area on Sept. 13.