Timmy was first spotted swimming in the region on March 3. It is not clear why the whale swam into the Baltic Sea, far from its natural habitat in the Atlantic Ocean.
The North Pacific right whale is critically endangered; according to NOAA's website, there are likely fewer than 500 remaining.
The nearly 50-foot yacht, named The Alboran Cognac, was 15 miles from Cabo Espartel in Morocco when an unknown number of orcas began ramming it.
Police and wildlife officials began trying to free the stranded whale in Venice, Florida, but the attempts were unsuccessful due to unsafe water conditions.
It's the jaw-dropping image of jaws - a great white shark - going from predator to prey
Footage captured by a Monterey Bay Whale Watch videographer shows the orcas breaching the water alongside one another - and he said they kept at it for seven hours!