Montgomery's execution marked the first time the US government has implemented the death sentence for a female prisoner since 1953.
Following Bangladesh approving the death penalty for rape, it joins a list of other countries that carry out this punishment for the crime.
"An Israeli in the UAE or Saudi Arabia or any of the Arabic countries in the world would receive the death penalty if they killed one of their citizens in their country."
Tsarnaev and his older brother set off a pair of homemade pressure-cooker bombs near the finish line of the world-renowned race.
104 people were executed for premeditated murder, including two who were minors at the time of their arrest.
A 40-year-old Chinese man convicted of murdering a family of four became the country's first foreigner to be executed since the disclosure of details on sentences carried out began in 2007.
In 2013, Junaid Hafeez was accused by students at the university where he taught of making blasphemous Facebook posts.
Presiding judge calls for body to be ‘dragged’ and ‘hung’ in public, something attorney general describes as ‘illegal, unconstitutional and immoral’