It's not certain, but it seems that the baby orca "J50" may have died at sea.
Endangered young killer whale declared dead, but search continues
"The grim news means scientists believe just 74 whales remain of the group found in the Pacific Northwest, which have failed to reproduce successfully in the past three years. The orcas have struggled with pollution, boat noise
and, most severely, a dearth of their preferred prey, chinook salmon, because of dams, habitat loss and overfishing."