Irene White, 43, was murdered 20 years ago on April 6, 2005, at her home, known as Ice House in Dundalk, Co Louth, which is regarded as one of the most violent killings in Irish history.
The Harry Potter star, 61, took on the role of Timothy Ratcliff in the smash hit drama and one scene saw him accidentally expose his genitals while sitting in a bathrobe.