(Seattle, WA)  --  The Center for Whale Research is confirming that a newborn southern-resident killer whale has died.  Ken Balcomb with the center tells the Seattle Times the orca calf died Tuesday, just half an hour after its birth.  Balcomb says the baby's mother, named J35, was seen carrying her dead calf on top of her head for hours Tuesday.  Meanwhile, researchers fear another member of the orca pod could be near death.  University of Washington biologist Deborah Giles tells the Seattle Times the orca named J50 is 4-years-old, but she's the size of a 1-year-old.  Giles says the whale is not getting enough to eat and that it will be a "miracle" if she survives.  The southern-resident killer whale population is critically endangered due to the diminishment of their food source: chinook salmon.