Police are offering a R100 000 reward for information that may lead to the arrest and conviction of suspects connected to the horrific attack on two couples at Rhodes Park in Kensington.
Lieutenant Colonel Lungelo Dlamini said three identikits of people connected to the case have been released.
In October, a gang of 12 men are alleged to have attacked two couples who had gone to the park after a church service in central Johannesburg.
They accosted the couples and beat the two men before stripping them and tying their hands and feet with their clothes before throwing them in the lake where they drowned.
One of the women was raped while the other escaped without any physical harm.
Two suspects, Thabo Nkala and Edmor Ndlovu, have already been charged and will appear in court again on December 9.
Dlamini said anyone with information may contact the investigating officer, Warrant Officer Bruce van der Schyff on 082 651 7769 at all hours, or information may be forwarded to Crime Stop at 08600 10111.