A barn door being lifted by a front-end loader fell and killed a 16-year-old boy in Woolwich Township, north-east of Kitchener-Waterloo.
Police were called to 1220 Halm Rd. in West Montrose on Saturday morning to respond to a workplace accident.
The Ministry of Labour has ordered that the barn door be secured with a chain and that the scene remain undisturbed.
A ministry official said can take up to a year to investigate incidents such as this.