A park operative suffered leg injuries whilst working on the Dino Roller ride. The operative was air lifted to hospital but his injuries were not life threatening. Source.
Accidents
Theme parks and roller coasters are statistically very, very, very safe. Out of the millions of people who ride the thousands of rides every year, there are only a small handful of incidents. You are statistically more likely to be involved in an accident driving to an amusement park than having one at a park. The rarity of accidents is one reason why the media report them, similar to plane crashes.
Every important element of a ride is inspected on a regular basis and every ride is tested every day without passengers before it opens. A ride might not open, or a safety system might activate, if there is an imperfection. For theme parks to operate, they must obtain insurance and one stipulation is their rides are frequently inspected and signed off by a strict Health & Safety governing body. Every theme park does what they can to prevent accidents because the negative press would be bad for business.
Having said all that, theme park accidents still happen…
Jordan Village Entertainment City, Amman, Jordan
A 13-year-old boy fell off a ride at the amusement park and was rushed to hospital, where he later died. Source
Gold Rush, Family Park, Centre-Val de Loire, France
A 63-year-old park employee was killed when the new coaster train stuck the man whilst it was in operation. The employee had entered a restricted area. Source (in French)
Formule 1, Parc Saint Paul, Hauts-de-France, France
A 32-year-old woman died after a falling from the 15-year-old Russian-made Wild Mouse coaster. Source
Mountain Coaster, Wisp Resort, Maryland, USA
A 56-year-old man died after being ejected from the alpine coaster sled into an embankment for unknown reasons. Investigators said the coaster ride and seat belts were determined to be in working order.
Zipline, Jungle Surfing, Queensland, Australia
A 50-year-old man died and his 48-year-old wife was seriously hurt in the Daintree Rainforest when their zip line cable snapped and they fell more than 52 feet (16m) to the ground. The woman was hospitalized with suspected spinal, pelvic, shoulder and arm injuries. Source
Crazy Mouse, Winter Wonderland, Stoke-on-Trent, UK
A 21-year-old man suffered a broken pelvis and two broken wrists after falling 40 feet (12m) from a portable roller coaster he was assembling. Source
Star Flyer, Firminy Fair, Loire, France
A 24-year-old mother of two died and her 20-year-old friend was hospitalized with traumatic brain injury after the women were ejected from their two-person chair approximately 33 feet (10m) to the ground. Source
Xtreme, Deerfield Township, New Jersey, USA
A 10-year-old girl died after she was was ejected out of her lap-bar secured seat from a Wisdom Rides Scrambler type ride at the Deerfield Township Harvest Festival. Source
AirMaxx360, Kingston upon Hull, Humberside, England, UK
A 21-year-old woman was ejected approximately 32 feet (10m) from her seat on the AirMaxx360 spinning ride at Hull Fair. She was hospitalized suffering a broken jaw, broken ribs, neck and abdomen wounds, after landing on a neighboring Sizzler ride. Source