by The Canadian Press

Last Updated Jun 26, 2015 at 1:03 pm EDT

Four died and one suffered serious injuries, while another worker was left suspended in mid-air.

A worker testified the project manager didn’t insist crew members be attached to lifelines.

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A project manager who oversaw a construction crew involved in a deadly scaffolding collapse in 2009 has been found guilty on five criminal charges.

Vadim Kazenelson was convicted on Friday on four counts of criminal negligence causing death and one count of criminal negligence causing bodily harm.

Court previously heard that Kazenelson managed to hold onto a 13th-floor balcony when the swing stage split in two on Christmas Eve, sending five workers plummeting to the ground.

Four died and one suffered serious injuries, while another worker — the only one properly secured to a safety lifeline — was left suspended in mid-air.

That worker, Shohruh Tojiddinov, testified the project manager didn’t insist crew members be attached to lifelines.

He also said Kazenelson asked him to lie about the incident afterwar