An investigation into whether a man defrauded the mother of one of the Waterkloof Four is underway, the Hawks said on Saturday.
“I will confirm that we are working on a fraud case but no one has been arrested,” said Hawks spokesman Captain Paul Ramaloko.
He could give further details.
The Beeld newspaper on Saturday reported Mariette Becker, the mother of Christoff Becker, had been blackmailed by a fellow prisoner of her son's.
The man allegedly demanded that Mariette Becker pay him R30 000 or else he would leak videos of her son, which he claimed could land him in trouble with the department of correctional services.
Becker and three others were released on parole in February after being jailed for beating to death a homeless man in Pretoria in 2001.
Becker and one of his co-accused Frikkie du Preez were re-arrested five days later after footage emerged of them allegedly drinking alcohol and using a cellphone at the Kgosi Mampuru prison.
On Friday, the High Court in Pretoria on Friday dismissed an urgent application for Becker's parole to be reinstated.
The video, reportedly taken on a cellphone, was posted on YouTube.
It was unclear whether that video was linked to the alleged blackmailer. - Sapa