Ontario's Ministry of Labour is investigating a workplace death Tuesday morning in Enniskillen Township.
Lambton OPP, EMS and the Petrolia Fire Department responded to the 5000-block of Rokeby Line around 11:30am.
Police say a 56-year-old man fell 20 ft to 25 ft to the ground from a roof under construction on the property.
He was taken to hospital where he was pronounced dead.
Ministry spokesperson Janet Deline says the worker fell while working on the roof trusses of a barn.
A ministry inspector attended the scene and issued an order for training records and a requirement for documentation to employer Bill Swan.