Meanwhile, the police had released a photo of the suspect, taken from a CCTV footage from a camera near the Lorong Ceylon Kuan Yin Temple.
Kuala Lumpur CID chief Senior Asst Comm Datuk Ku Chin Wah said the man was still believed to be in the city. It is not confirmed whether the police know the suspect's real name yet.
He said the police had released a photo of suspect, taken from a CCTV footage from a camera near the Lorong Ceylon Kuan Yin Temple.
Najadi, who helped form Arab-Malaysian Development Bank in 1975, was walking to his car with his wife along Jalan Ceylon after negotiating a land deal at the temple.
The road is just a couple of hundred metres away from the headquarters of the bank, now known as Ambank Bank.
Police said a man came up behind the 75-year-old ex-banker and opened fire, hitting him in the chest and lower abdomen. The man fled in a waiting taxi.
Najadi died on the spot while his 49-year-old Malaysian wife Cheong Mei Kuen was wounded in the arm.
Ku today said police had detained the driver of the taxi that the shooter had escaped in last night.
He said the 44-year-old was detained in a coffee shop - July 31, 2013.