A one-time free-roaming Utah stallion, whose picture sparked an Internet campaign demanding his release, died last week of a heart attack at a BLM holding corral in Delta as a veterinarian was preparing to geld him. The 26-year-old black-and-gray horse â officially known as Grulla stallion 3970, less officially known as âAntoninoâ â was to be sent to a South Dakota ranch where wild horses run free. It was supposed to be a happy ending to the controversy surrounding the studâs removal from the W... <img src="http://mngislctrib.112.2O7.net/b/ss/mngislctrib/1/H.17--NS/0?&pageName=RSS" height="1" width="1" border="0" alt=""/> <iframe src="http://www.sltrib.com/csp/mediapool/sites/sltrib/pages/garss.csp" height="1" width="1" > </frame>