Witness A, who is testifying before the Madlanga Commission in Pretoria, has detailed how the murder of Vereeniging-based engineer Armand Swart helped their team to crack related cases.
Swart was shot 23 times in April last year after exposing corruption at Transnet.
Witness A is testifying remotely however, the voice is audible . Witness A is one of three detectives whose testimony will be based on their investigation of criminal cartels.