Johannesburg - Convicted killer Clive Derby-Lewis's condition remains unchanged, the correctional services department said on Tuesday.

“There is no new development on him,” spokesman Manelisi Wolela said.

On Thursday, Derby-Lewis's wife Gaye said he had been diagnosed with terminal lung cancer.

“(It) is inoperable because of his age and frailty,” she said at the time.

“Clive (will) stay in hospital for another week. After that, he is scheduled for radiation and chemotherapy from May 6.”

An application for medical parole would go ahead this week.

Derby-Lewis and Janusz Walus were convicted of killing SA Communist Party general secretary Chris Hani. Hani was shot dead in the driveway of his home on April 10, 1993. Derby-Lewis, who was sentenced to 25 years behind bars, has already served more than 20 years of his sentence.

The 78-year-old has previously been denied medical parole.

He has also been stabbed on two different occasions by inmates at the Kgosi Mampuru Central Correctional Centre in Pretoria. - Sapa