I've done a bit more searching and found the answer!

The SS Iroquois was a small steamer measuring 72 feet in length which provided a regular ferry service between the islands off the coast of Vancouver.
On April 11, 1911 the Iroquois sailed out of Sidney, Vancouver Island, heading for the smaller islands off the coast. Soon after it left Sidney the cargo began to shift and the ship started to list. It capsized and sank in a squall west of Ker Island. No passenger list
existed but it was estimated that about 22 people were killed, including (possibly) one of my ancesters.
Many of the other victims were buried in the historic Ross
Bay Cemetery in Victoria on Vancouver Island.

Ian