tillicum. >> he was easy going. he learned quickly. he learned well. >> reporter: among the other trainers, 20-year-old kelsey burn. she just finish add show with the killer whales when she slipped and fell into their enclosure. he arrived minutes later. >> the orcas were surprised one of the trainers seemingly jumped into the pool, although fallen and sort of excited about that. it was something completely out of the norm. >> reporter: witnesses say the whales, including tillicum kept burn from reaching the sides, repeatedly pulling her under the fridge kid water. >> they couldn't get her and finally, she -- she didn't come up anymore. >> reporter: a trained diver volunteered to go and retrieve the body. >> the co-worker just suffered, drowned in someway and in the tank you are about to go in with. >> this wasn't a malicious