The Alberta Serious Incident Response Team says officers went to a rural property north of Edmonton on Saturday to respond to a trespassing complaint.
ASIRT says a 47-year-old man was found in a field nearby and went down after he was shot during a confrontation.
An armed standoff followed and attempts to communicate with the man were unsuccessful.
Emergency response officers approached and found him dead.
ASIRT investigators found a loaded .22-calibre rifle at his side and a .30-.30 lever-action rifle in the field.
The carbine rifle fired by police was also seized.
The investigation continues.