An orca has been sighted off Montara Beach

One of our readers reports seeing an orca at Montara Beach a couple of weeks ago:

I saw the Orca, as did several other surfers that day. I also saw a flyer in the tackle shop window at Princeton Harbor asking for reports on siting of Orcas seen around our area, apparently they rarely wander out of Monterey Bay.  It was definitely an Orca, 18" tall dorsal fin and a blow hole.

Does anyone else have experience with orcas in this area?