The condemned killer of Saudi embassy official Khalaf Al Ali was hanged at Kashimpur High Security Central Jail in Gazipur last night.
Saiful Islam Mamun was hanged at 10:01pm, said Shajahan Ahmed, jail superintendent.
Later, an ambulance carrying his body started for his village home in Bagerhat, he said.
Earlier, Mamun's relatives met him at the jail, the jail superintendent added.
On October 7 last year, the Supreme Court dismissed a review petition filed against its judgment that upheld Mamun's death penalty in the murder case.
The SC upheld the High Court verdict that sentenced Mamun to death, and gave life term to three others -- Md Al Amin, Akbar Ali Lalu and Rafiqul Islam -- for killing the Saudi national.
Khalaf, 45, a non-diplomatic official with the consular section of the embassy, was shot dead near his Gulshan residence on the night of March 5, 2012.
A murder case was filed with Gulshan Police Station against five people, two days after the killing.
On December 30, 2012, a Dhaka court sentenced all the five accused to death.
But the judgment was overturned when the convicts' appeal and death sentence were sent to the HC.
In 2013, the HC acquitted fugitive Selim Chowdhury, commuted the sentences of Amin, Akbar and Rafiqul to life in prison and upheld the death sentence of Saiful.
The state then filed an appeal with the SC in 2014.