Nurse Lori Marie Key sings 'Amazing Grace' during a COVID-19 memorial, with lights placed around the Lincoln Memorial Reflecting Pool, Tuesday, Jan. 19, 2021, in Washington. (AP Photo/Alex Brandon)Livonia nurse Lori Marie Key performed a rendition of “Amazing Grace” Tuesday at the national COVID-19 memorial ceremony in Washington D.C.“Working as a COVID nurse is heartbreaking. It gives me strength during difficult times and I believe it helps heal.”Michigan nurse Lori Marie Key, who went viral singing 'Amazing Grace' at work, reprises the song at the national COVID-19 memorial ceremony pic.twitter.com/8OtCaNU5mw — NowThis (@nowthisnews) January 19, 2021Key, a nurse at St. Mary Mercy Hospital, went viral last year after singing for fellow health care workers. “All of this is kind of bringing me back to my roots, something that I’ve always loved to. It’s just an honor and a blessing to be able to do nursing and singing at the same time,” she said on Monday.