The first round of the inquest was held in August. The hearings were in recess for over a month, but resume Monday morning and are expected to run through October.
Sinclair died after not being triaged and receiving no treatment in the Health Sciences Centre's ER unit in September 2008.
His death was later attributed to a treatable bladder infection.
Manitoba's chief medical examiner, Dr. Thambirajah Balachandra, has said Sinclair would have lived if his blocked catheter had been changed and his infection treated.
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Members of the public and patients who were in the emergency waiting room during Sinclair's 34 hours there are also expected to testify..
The witnesses will include a woman who insisted that a security guard check on Sinclair. By the time the guard went over to him, he had already died.
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In August, the inquest saw hospital surveillance video footage that showed staff members passing by Sinclair as he sat in his wheelchair.