Officers closed Pitt Street between Bathurst and Liverpool Streets from about 2:30am (AEST) until soon after 7:00am on Thursday, as part of an ongoing investigation into the death of 21-year-old Roberto Laudisio Curti.
Mr Laudisio Curti died on March 18, after he was tasered by police in Sydney's CBD.
Police say a critical incident investigation is being conducted and is being independently overseen by the NSW Ombudsman.
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All information will be passed onto the coroner, police said.

