Patriots tight end Aaron Hernandez will be charged in connection with the shooting death of a 27-year-old Dorchester man, a law enforcement source told WBZ NewsRadio 1030 on Friday. According to that source, an arrest warrant has been issued on a charge of obstruction of justice. It is expected that State Police will be responsible for arresting Hernandez, but it is not yet clear when and where Hernandez was going to be arrested. The source added that it is possible that charges could eventually be upgraded. The body of 27-year-old Odin Lloyd of Dorchester was found Monday in a field in North Attleborough, about half-a-mile from Hernandez’s home. He had been shot in the head.