UK Prime Minister Theresa May, Irish President Michael D. Higgins and Irish Taoiseach Leo Varadkar attended the funeral of 29-year-old journalist Lyra McKee at St. Anne's Cathedral in Belfast on Wednesday.
Labour's Jeremy Corbyn was also present at the ceremony, as well as Democratic Unionist Party leader Arlene Foster and her Sinn Fein counterpart Mary Lou McDonald, sitting side by side.
Footage shows mourners wearing Marvel superhero-related shirts in honour of McKeen, a fan of the franchise. Mourners were also reportedly wearing Harry Potter-themed clothing.
Father Martin Magill, one of the priests who led the ceremony, received a standing ovation after raising the question as to how political rivals were only now able to unite.
"Why in God's name does it take the death of a 29-year-old woman with her whole life in front of her to get to this point?" he asked.
According to reports, mourners were told that McKee was planning to propose to her partner Sara Canning next month.
McKee was struck by a bullet during rioting in Derry last Thursday. Police blamed dissident Republicans known as the 'New IRA' for the murder and are treating McKee's death as a 'terrorist incident.'