A tragic accident at Jacob’s Pillow Dance Festival in Becket, Massachusetts, has claimed the life of longtime production manager Kat Sirico, 40, the Berkshire District Attorney’s Office confirmed Saturday. The fatal incident occurred Friday afternoon while Sirico and a summer intern were moving heavy staging platforms on a dolly across the performance center’s grounds. According to the DA’s statement, the dolly began to roll uncontrollably down an incline. In an attempt to stop it, Sirico stumbled and fell. The dolly subsequently ran over them, and the platforms they were transporting fell on top. Bystanders on site rushed to administer emergency…