Orca sightings can be are event even in Alaskan waters, at least they have been for me given the amount of time I have spent on the water. I saw these en route to the Kenai Fjords Glacier Lodge in Kenai Fjords National Park. Video links are below.
Resident orcas tend to have diets that are mainly fish. The closely related “transient” killer whales form smaller pods and have a diet that includes marine mammals. “Off shore” killer whales are rarely seen and their pods of up to 200 whales feed on schooling fish. To read more about orcas, click here.
In this second video from another orca pod you can see there is a male in the group judging from the taller dorsal fin.