Six people were still receiving treatment in an Eastern Cape hospital on Tuesday morning following Sunday's shooting at Mdantsane in East London.
Cecilia Makiwane Hospital matron Lulama Geleba said the number of fatalities had risen to 12 following the death of Mawethu Mqala, 28, on Monday morning.
She said Mqala died while being transferred to the St Dominic Hospital after her family requested the move.
Geleba said Lindiwe Ntoni, 45, Nozukile Mengu, 49, Ntombizanele Ntweni, 25, Fuzile Konono, 54, Nosisi Skweyiya, 59, and Mfundo Mooi, 18, were out of danger and in a stable condition in the hospital's general surgical ward.
One of the victims, who suffered a fractured ankle, would undergo an operation to remove a bullet.
Geleba said the 18-year-old Mooi sustained a spinal injury and had been left permanently paralysed from the waist down.
The teenager would be transferred to Cape Town for further treatment.
Off-duty security guard Bulelani Vukwana went on the rampage on Sunday after the relationship with his girlfriend Noluvuyo Mbenya collapsed.
Mbenya's father was among the victims.
Vukwana later turned the gun on himself when he was cornered by police. - Sapa