SeaWorld officials say Tilikum will participate in the park's "Believe" show beginning Wednesday morning.
Tilikum drowned 40-year-old Dawn Brancheau on Feb. 24, 2010, and has not participated in a show since then. Park officials are spending millions making safety upgrades.
The park is still working on plans to get trainers back in the water with the whales. The federal Occupational Safety and Health Administration last summer accused SeaWorld of recklessly putting trainers in danger. The company is fighting OSHA's citations and $75,000 fine.
SeaWorld Animal Training Curator Kelly Flaherty Clark says they feel it's an important part of Tilikum's physical, social and mental enrichment to perform again.