A fun park visit in Port St. Lucie ended in tragedy after a six-year-old girl died following a go-kart accident at Urban Air Adventure Park on Saturday night. Port St. Lucie Police responded to the incident, and the child was airlifted to HCA Lawnwood Hospital, where she passed away on Sunday. The park, which normally would be open, was closed today by managers. Authorities are working to determine the cause of the tragic accident. However, one resident who witnessed multiple prior incidents says the go-karts have long been a concern....