reporter: he started working at a local marine park called sea land of the pacific. i would go after school and weekends, you know, growing up and just thought that s how everybody grew up. reporter: sea land of pacific used to be here there is nothing left of the old place. it was an oceanarium and there were nets that separated the animals, the sea lions, and killer whales. he eventually became a trainer working with the three killer whales. his favorite a small male named 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.
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