Kyle Knox died when a vertical drilling rig collapsed at the future site of the York University subway station on Oct. 11, 2011.
It took emergency crews took 14 hours to free Knox's body.
Five people were also injured in the incident, one of whom was treated for serious but non-life threatening injuries.
The Ontario Ministry of Labour announced Friday it was laying four charges under the OHSA against both Advanced Construction Techniques Inc. and OHL-FCC GP Canada Inc.
The ministry said in a statement the two companies had allegedly failed to "design an adequate work platform" for the mobile drill, failed to ensure that the drill "was operated in accordance with the operator’s manual" and neglected to design and carry out the project so that it could handle "all loads or forces" it would likely be subject to.
Representatives for the companies are scheduled to appear in court on Nov. 1.Suggest a correction