Alberta Occupational Health and Safety is investigating a third workplace fatality in the province in about a week.
The latest death occurred around 10:30 p.m. Sunday, about 60 kilometres south of Grande Prairie.
RCMP say a 31-year-old man was struck by heavy machinery.
No other details have been released.
A 37-year-old man was struck and killed by a vehicle while working near Grande Prairie on Mar. 4.
Another worker died the same day in a fall at an apartment complex under construction in Leduc.