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Samereh Alinejad (C), the mother of Abdolah Hosseinzadeh who was killed by a fellow Iranian, named Balal, in a street fight with a knife in 2007, speaks during Balal's execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040182 )

The mother (C) of an Iranian man named Balal who killed a fellow Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, pleads to God at the start of his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040651 )

Officials prepare the noose for the execution of Balal, who killed an Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529037878 )

Iranian women pray for forgiveness as Balal, an Iranian man who killed a fellow Iranian Abdolah Hosseinzadeh in a street fight with a knife in 2007, is brought to the gallows during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529038082 )

Balal (C), who killed an Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, is brought to the gallows by judicial officals during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529038144 )

Balal, who killed an Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, is brought to the gallows during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529037784 )

Balal, who killed an Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, is brought to the gallows during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529037800 )

Balal, who killed Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, is pictured blindfolded next to a noose during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040124 )

Balal, who killed Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, reacts as he stands in the gallows during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040123 )

The mother (R) of Abdolah Hosseinzadeh, who was murdered in 2007, slaps Balal who killed her son during the execution ceremony in the northern city of Nowshahr on April 15, 2014 just before she removed the noose around his neck with the help of her husband, sparing the life of her son's convicted murderer. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529037795 )

Samereh Alinejad (R), the mother of Abdolah Hosseinzadeh who was killed by a fellow Iranian, Balal, in a street fight with a knife in 2007, cries after she spared the life of her son's convicted murderer with an emotional slap in the face as he awaited execution with the noose around his neck in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529038140 )

The mother of an Iranian man Balal (L), who killed an Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, cries with the mother of Abdolah Hosseinzadeh after she forgave Balal, giving him an emotional slap prior to removing the noose around his neck in the gallows during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529037787 )

Samereh Alinejad (C), and Abdolghani Hosseinzadeh (R) the parents of Abdolah Hosseinzadeh who was killed by a fellow Iranian, named Balal, in a street fight with a knife in 2007, stand next to the gallows during Balal's execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040118 )

A police office kisses Abdolghani Hosseinzadeh (C-R) the father of Abdolah Hosseinzadeh who was killed by a fellow Iranian, named Balal, in a street fight with a knife in 2007, during Balal's execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040160 )

The mother of Iranian national Balal (bottom), who killed fellow Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, kisses the feet of Samereh Alinejad (C), the mother of Abdolah, after her son was pardoned by the parents of the victim during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040694 )

The mother of Iranian national Balal (bottom-L), who killed fellow Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, kisses the hand of Abdolghani Hosseinzadeh (C-R) the father of Abdolah, after her son was pardoned by the parents of the victim during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040663 )

Bystanders applaud Abdolghani Hosseinzadeh (R) the father of Abdolah, an Iranian youth killed by fellow national Balal in a street fight with a knife in 2007, after he and his wife pardoned their son's convicted murderer, during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040753 )

Samereh Alinejad (L), Abdolghani Hosseinzadeh (R) and their daughter sit on a sofa in front of a picture of their son Abdolah Hosseinzadeh who was killed by a fellow Iranian, Balal, in a street fight with a knife in 2007, after they spared the life of their son's convicted murderer during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529039381 )

The mother of Iranian national named Balal (C), who killed fellow Iranian youth Abdolah Hosseinzadeh in a street fight with a knife in 2007, cries in her home ahead of his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529040640 )

Samereh Alinejad (L) and Abdolghani Hosseinzadeh (R) mourn at the grave of their son Abdolah Hosseinzadeh who was killed by a fellow Iranian, Balal, in a street fight with a knife in 2007, after they spared the life of their son's convicted murderer during his execution ceremony in the northern city of Nowshahr on April 15, 2014. AFP PHOTO/ARASH KHAMOOSHI/AFP/Getty Images ( 529039577 )