Borrowman pointed out a distinctive pale-grey saddle patch behind the dorsal fin and identified theorca as one he sees frequently: a 43-year-old male known as A38.
Inspired by the films, an international campaign began in 1993 to free Keiko and return him to the wild - the first orca whale to be freed in this way.
The six-tonne orca died on Friday from suspected pneumonia in the Norwegian bay where he had been living out his days since his release from captivity.