Ntokozo Mdluli, popularly known by his stage name, K.O, is a South African rapper who rose to prominence with the group Teargas after releasing their critically acclaimed debut album K'shubile K'bovu in 2006, under Electromode Music.

Teargas, which then had three members, K.O, Ntukza and Ma-E, later released three other albums titled, Wafa Wafa (2008), Dark or Blue (2009) and Number Number (2012) (stylized as Num8er Num8er) which were all commercially successful. K.O, co-runs a music and entertainment company called "Cashtime Life".

K.O released the singles "Mission Statement", "Son of a Gun" and "Caracara" preceding the release of his upcoming solo debut studio album, Skhanda Republic which was released on November 7, 2014

In May 2014, K.O lost a significant amount of weight. This sent social media into a frenzy with rumours that K.O was HIV positive. However, his manager Thabiso Khati denied those rumours stating that K.O had undergone a strict diet plan and was exercising regularly. K.O later released a statement regarding his health and posted a picture of his blood test results on his Twitter and Instagram page, showing he was HIV negative.