Brig Athlenda Mathe

Brig Athlenda Mathe is not mentioned in any of the provided news articles. Therefore, it is impossible to provide a summary about her based on the given information. The articles discuss a former police officer charged with murder, the family of Zambia's ex-President Lungu dismissing poisoning allegations, and the death of a man named in a South African police corruption probe. Without any mention of Brig Athlenda Mathe, I cannot create a relevant summary about her involvement or significance in these events.