A killer may have walked free after an autopsy report into the suspicious death of an Alberta man in 2010, an investigation by CBC’s The Fifth Estate has found.

The office of B.C.'s attorney general has appointed one of the country's top defence lawyers to probe the conduct of prosecutors involved in a second-degree murder charge laid against a babysitter in 2011.

Senior officials in Alberta's Justice Ministry did not disclose a report that shook the foundations of several murder charges and cast into doubt numerous findings of a medical examiner in Calgary a decade ago, an investigation by The Fifth Estate has found.