Four workers died when scaffolding at this Kipling Avenue apartment collapsed on Christmas Eve. ((CBC))

The Ontario Ministry of Labour has charged two companies in the deaths of four migrant workers who were killed in a workplace accident on Christmas Eve last year.

Five men were making balcony repairs at a Toronto apartment building, when they plummeted 13 storeys to the ground on Dec. 24.

Four of them died, and a fifth man was seriously injured with two fractured legs and a broken spine.

After months of investigation, spokesman Matt Blajer said, the Ministry of Labour laid a total of 61 charges against two companies Friday.

Metron Construction Corp. faces 30 charges under the Occupational Health and Safety Act. A director of Metron Construction faces an additional 16 charges, and a supervisor faces eight charges.

Swing 'N' Scaff Inc., the company that supplied the platform, faces four charges. A director for the company faces an additional three charges.

Hearings on the case will begin at the Ontario court of justice in Toronto on Sept. 30.