Here is info on the 2 deaths that happened at Primeval Whirl. (From Wiki)
On November 27, 2007, a 63-year-old employee died from a brain injury sustained four days earlier when she was hit by a ride vehicle after falling from a restricted area of the ride platform.[55] On May 23, 2008, OSHA fined Walt Disney World US$25,500 and charged the company with five safety violations. The fines were: $15,000 for three serious violations; $7,500 for still missing a handrail that had been reported; and $3,000 for not responding to OSHA requests within the requested time period.
On March 13, 2011, a 52-year-old employee sustained head injuries while working on the ride and was airlifted to a local hospital, where he later died. The ride was undergoing maintenance and was closed to the public at the time of the incident.