William Armstrong is a Canadian actor who played Jonathan Earnshaw QC, who was present at Justin Burton's trial for the murder of Stephen Mackintosh in November 2005. He also played a doctor who treated Charlie Dean (who had been diagnosed with leukemia) from January to February 2008.
Armstrong's other acting roles include Bergerac, Screen One, Screen Two, Soldier Soldier, Silent Witness, Coronation Street, Dalziel and Pascoe, The Courtroom, The Bill, Holby City, Taggart, New Tricks, Casualty and Doctors.