Rekord earlier reported that Lieutenant-Colonel Reinier Lagois (42) was shot fourteen times at his home.
The Hawks have since arrested a Pretoria west police officer in connection with the murder.
Hawks spokesperson Brigadier Hangwani Mulaudzi said the officer, Constable Rishen Rampashard, was arrested on Friday, and briefly appeared in the Pretoria Magistrate’s Court on Monday.
According to Hennie Lagois, his brother had lived with his ex-girlfriend, a former station commander at the Pretoria West police, in the house where he was murdered.