Phan Ngoc Le, 56, is currently under investigation for "murder."
She said while her family was gathering for a death anniversary party Sunday evening, a man in his 30s came and urinated in front of her house in an alley.
As she asked the man to leave, they started to quarrel.
The man then asked a friend of his to come and throw chairs and tables at her.
She got angry and with a fruit knife in hand, stabbed him.
The man was taken for emergency treatment but later died of his wounds.