Public violence erupted as members of the community protested against poor service delivery in the area.
Police spokesperson Siyabulela Malo says that when police arrived at the scene, the woman was already dead.
The two Belgian tourists agreed to open a case of attempted armed robbery, and the man was subsequently arrested.
The suspects were arrested just over a week after Agnes Elaine Burns, 91, and Rosemary Langton, 87, were killed in the early hours of October 10.
The provincial police commissioner commends the police officers for not resting until the killers were apprehended.
Two robbery suspects, both aged 40, were arrested by Durban police following a dramatic car chase and shootout in V section, Umlazi, on Wednesday.
The police in Sunnyside, Tshwane, have finally tracked down a suspect accused of stealing property worth around R500K from an NGO in Hatfield more than a year ago.
According to a chairperson of the board, the man was released on bail of R5,000 under strict conditions.
More than 16kg of heroin, cash and other paraphernalia were seized.
A 42-year-old woman will appear in court on Monday after the fatal stabbing of a man 10 years younger than her in Graaff-Reinet, Eastern Cape police said.