Aaron Hernandez's apparent link to a homicide investigation in Massachusetts has cost him an endorsement. Cytosport, a sports nutrition company, cut ties with Hernandez on Friday, three days after the New England Patriots tight end was first mentioned in connection with the slaying of a 27-year-old man in North Attleboro, Mass. Cytosport released a statement saying it was terminating its contract with Hernandez, "effective immediately."