A Sydney man accused of killing his mother's lover before fleeing to Singapore has consented to police extraditing him to face a murder charge.

Lawyers for Andrew Iskandar, 20, flew last week to Singapore, where he has been held shortly after the killing of Malaysian-born consular worker Mohd Shah Saemin, The Sydney Daily Telegraph reported.

Shah Saemin, 43, was allegedly beaten with a hammer and stabbed with a knife outside his flat in Leichhardt, in the inner-western Sydney, in February following revelations of his affair with Nita Iskandar.

Police will allege that Nita's husband, Hazairin Iskandar, 55, and their son discovered the clandestine relationship and carried out surveillance on Shah Saemin for some time before the killing.

Hazairin was charged with murder and remains behind bars, while his wife has been charged with being an accessory after the fact and hindering a police investigation. She is on bail.

Andrew Iskandar fled Australia shortly after the killing - allegedly with

the help of his mother - but was arrested in Singapore when he arrived.

The newspaper said solicitor Ben Archbold visited Andrew in Singapore's

Changi prison last week and said that his client consented to the extradition.

"It has been a difficult time for my client in the notorious prison and he

looks forward to defending the charges upon his return to Australia," Archbold told reporters outside the court.

Police are expected to bring Andrew back next month.

A court was previously told of police allegations that Nita helped her

son leave Australia, asking a travel agent how to get an urgent plane ticket overseas.

Hazairin and his wife both faced Central Local Court Tuesday when Magistrate Allan Moore adjourned the matter until July 13. 

- Bernama