Ali Hassan al-Majid, the man known as 'Chemical Ali', has been executed in the Iraq capital.
An Iraqi government spokesperson confirmed that Majid was hanged this morning - a week after he received a fourth death sentence.
He was convicted and received a fourth death sentence on charges relating to the Halabja chemical attack that killed around 5,000 Kurds.
A close cousin of Saddam Hussein, Majid earned his moniker for ordering poisonous gas attacks in a scorched-earth campaign of bombings and mass deportations that killed an estimated 182,000 Kurds in the 1980s.
He had already been condemned to hang for genocide over the Kurdish offensives when he received a second death sentence in December 2008 for war crimes committed during the ill-fated 1991 Shia uprising in southern Iraq.
And in March last year, the Iraqi High Tribunal handed down a third death sentence over the 1999 murders of dozens of Shias in the Sadr City district of Baghdad and in the central shrine city of Najaf.
Separately, a triple car bombing in Baghdad has left at least 36 people dead and 71 wounded.
The three massive blasts occurred in quick succession, with the first bomb exploding in the Abu Nawaz district.
This was followed minutes later by two loud explosions near the international Green Zone.
Plumes of smoke have been seen rising over Abu Nawaz, near the Palestine and Sheraton hotels.
