Photos show a killer whale swimming near Mission Bay. At one point, the orca swims up to a group of people on-board the Pirateer, a whale watching boat with San Diego Whale Watch.

On Thursday, whale watchers snapped photos of an orca off the northern coast of Coronado Island. Marine experts believe the two sightings are of the same whale that also visited the area last summer.

"Certain markings, it's like a fingerprint identification, and it is without a doubt the same whale," marine biologist Melissa Galieti told media partner 10News. "It's very possible that this particular whale was an orphan because they stay with their families and mothers for their entire life."