No idea if a Morrison was involved with the crew. However, John L Jamieson, Master Mariner, died in May 1969 in the St Vincent's Hospital, Vancouver, B.C., Canada & his wife Johann Ursula Gowdie (also born in Shetland) d. July 1979 also in St Vincent's Hospital Vancouver, BC, Canada.
Am wondering if you have a list of the ship in question? If so have you looked at Shipping Lists?