http://waltham.patch.com/articles/waltham-triple-murder-victims-killed-by-neck-injuries
Having your throat slit is extremely unusual. Correct me if I’m wrong, but when Americans kill somebody they do it by shooting them or stabbing them. But when Muslims kill, they prefer to chop heads off or slit throats. I knew a Muslim who sacrificed goats in his suburban back yard. He and all the family had training in how to do it right. Even the children participated. (The neighbors would call the Sheriff and the deputies would ask, “What are you doing?” and he’d say, “Sacrificing a goat to Allah.” The deputies would say, “Have a nice day.”)
He probably told s friend of his plans and then killed him when the response wasn’t what he expected.