The wife of a murdered Mamelodi West policeman was arrested on Tuesday, said Pretoria police.

"The wife of a Mamelodi West police captain who was shot and killed on September 19 was arrested alongside three other suspects around 4am this morning [Tuesday]," said Captain Bonginkosi Msimango.

The woman, two men and one of the men's girlfriend's, all aged 25, were arrested following the death of the police captain. He was shot twice in the head and once in the body at his Mamelodi West Section M home.

According to Msimango, the policeman, who was busy in his spaza shop at the time of the shooting, was approached by two men who were known to him.

"His wife could have hired the suspects," said Msimango.

"Right now we are investigating a case of murder against the accused."

Sapa