Mantsoe is on trial for allegedly assaulting and killing his girlfriend as well as obstructing the ends of justice.
Mokoena’s body was discovered in an open veld in Lyndhurst, Johannesburg in April last year.
Mantsoe alleges that Mokoena committed suicide.
State witness Stephani Leon, a friend of Mokoena, says on the 26th of March last year, Mokoena called her to her apartment where she been living with Mantsoe.
She says Mokoena was drinking and wanted them to go to Soweto to celebrate her birthday.
Upon their arrival at the Soweto club, they met Mantsoe. Leon says he instructed her to take Mokoena to his car as she was drunk.
As they were driving back to Sandton, Mokoena kept saying Mantsoe didn’t care about her and should go back to his other girls.
Leon says an angry Mantsoe turned around while driving and grabbed Mokoena by the neck.
The case continues.