Killer whale &#39;Tilikum&#39; appears during its performance in its show &#39;Believe&#39; at Sea World on March 30, 2011 in Orlando, Florida. &#39;Tilikum&#39; is back to public performance March 30, the first time since the six-ton whale has performed since killing trainer 40-year-old trainer Dawn Brancheau at the marine park on February 24 2010, after Sea World Parks &amp; Entertainment president Jim Atchinson signed off on the decision this week.