Charlotte Kruger, 66, and her husband, 70, were watching TV at around 2am when two armed men broke into their home last Friday.
“They tied the elderly couple with a wire and stuffed rags in their mouths,” said police spokesman Colonel Leonard Hlathi.
He said the woman died as a result of the rag being pushed too deep.
The robbers stole a plasma TV, hi-fi system and a firearm.
Hlathi appealed to members of community to assist police in catching the robbers.
He said once arrested the men would be charged with murder and house robbery.