Brian Sinclair was found dead in his wheelchair after waiting 34 hours for care at Winnipeg's Health Sciences Centre in September 2008. (CBC)

Relatives of Brian Sinclair, who was found dead in a Winnipeg emergency waiting room in 2008, are filing a complaint with the Manitoba ombudsman.

Members of Sinclair's family were denied information from the Winnipeg Regional Health Authority that they need to prepare for an eventual inquest, a spokesman said.

The family had sought videos and documents from the health authority and filed an application under the Freedom of Information Act.

The authority has said it would hand over "relevant" information to the person heading up the inquest, Toronto lawyer Vilko Zbogar, who represents Sinclair's family, told CBC News on Thursday.

He accused the health authority of "treating the inquest as a complete gag order on every single document that relates to Brian Sinclair's death and the institutional responses after his death."

Sinclair, a 45-year-old double amputee with a speech problem, was found dead in his wheelchair after waiting 34 hours for care at the Health Sciences Centre.

Sinclair's death could have been prevented if a blood infection had been treated, Dr. Thambirajah Balachandra, Manitoba's chief medical examiner, said within days of the death.

Balachandra announced in February 2009 that an inquest would be held but this has not yet happened.

Sinclair's family has filed a lawsuit against several medical staff, the regional health authority and the Manitoba government for $1.6 million.

The statement of claim, filed Sept. 15 in the Court of Queen's Bench, lists 18 defendants, including the Winnipeg Regional Health Authority and its director of clinical care, Brock Wright.