VAUGHAN, Ont. - 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.

"We have reason to believe Panovski may be armed and should be considered dangerous," says OPP Det.-Superintendent Dave Truax.

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.