Cause for Sr Clare sainthood to open on fifth anniversary of death The cause for the canonisation of Derry nun, Sister Clare Crockett will be opened in April on the fifth anniversary of her death. Seamus McKinney 01 February, 2021 01:00 A mural was painted on a gable wall close to Sister Clare Crockett's Brandywell home last year. THE religious order to which Derry nun Sister Clare Crockett belonged is to open the cause for her canonisation on the fifth anniversary of her death in April. Sr Clare (33) was killed when the building in which she was teaching music collapsed in an earthquake in Ecuador in April 2016.