Lea Michele is grieving following the sudden death of boyfriend and Glee co-star Cory Monteith. After the coroner announced he died of a mixture of heroin and alcohol, Michele issued a statement via her reps Tuesday."Lea is deeply grateful for all the love and support she’s received from family, friends, and fans. Since Cory’s passing, Lea has been grieving alongside his family and making appropriate arrangements with them," read the statement.