DALLAS (AP) — A Dallas police officer broke her silence Friday about the night she killed a young accountant who lived in the apartment right above hers, telling jurors that she has to live with the guilt every day and that she wished their roles were reversed.

Amber Guyger tearfully told the packed courtroom at her murder trial that she was sorry for killing 26-year-old Botham Jean last September, explaining that she mistook his fourth-floor apartment for her own. But during cross-examination, prosecutors cast doubt on Guyger's grief, wondered why she didn't call for backup instead of confron...