Peta Murgatroyd is mourning the death of her father, who she called "the greatest dad" and "my teddy bear." The "Dancing with the Stars" pro, 36, took to Instagram on Thursday to share that her father, Derek John Murgatroyd, had died at the age of 81. "This is the end of our ride earth side," she said. Read more in our link in bio. #Grief #DWTS #PetaMurgatroyd #Culture