British Columbia's workplace safety agency has released the first official account of a Deadpool 2 stuntwoman's death, saying SJ Harris was thrown from her motorcycle and propelled through a plate glass window.

The initial incident report issued by WorkSafeBC confirms witness accounts and adds new details to Monday's tragic accident in Vancouver during filming of the sequel to the popular superhero movie starring Ryan Reynolds.

SJ Harris

Joi SJ Harris died in a motorcycle accident while filming a stunt for the film Deadpool 2. (SJ Harris/Instagram )

The report, which only refers to Harris as the "worker," says she had been rehearsing a stunt that involved driving a Ducati 939 Hyperstrada motorcycle out the open doors of a building, across a concrete pad and down a ramp that had been built over three stairs before coming to a stop.

Failed to stop

It says during the first shooting of the scene, she continued driving beyond the planned stopping spot, continued down a second ramp and across the road.

The report says the motorcycle struck a concrete sidewalk curb and Harris was thrown off the motorcycle and propelled through a plate glass window.

WorkSafeBC is continuing to investigate and has asked the local production company to conduct both a preliminary investigation, which was due Wednesday and a full investigation, due one month from the incident.

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