Ernest Johnson's legal team argued he had an intellectual disability
A man from Missouri in the US has been executed for murdering 3 people convenience employees in 1994.
The 61 year-old was injected with a lethal dose of pentobarbital yesterday evening.
This is despite pleas for Mr. Johnson's life to be spared.
His legal team argued he had an intellectual disability, caused by foetal alcohol syndrome, after his mother drank heavily during pregnancy.
Campaign groups had joined the call for a stay of execution - as had a representative of Pope Francis.

"A Lot Of People Got Beaten Badly": Sallins Man Gives Update After Last Month's Intercepted Gaza Flotilla
Starmer Under Pressure Following Rumours Of Health Secretary Resignation Later Today
Eurovision Song Contest Begins Tonight As Ireland And Other Countries Boycott
WHO Expects More Hantavirus Cases Among The Cruise Ship Passengers
Two Irish Passengers On Virus-Stricken Cruise Ship Now In Care Of HSE
Musical Stars Announced for 2026 World Cup Opening
Irish Citizens On Virus-Stricken Ship "Safe And Well", As Protests Break Out In Tenerife
WHO Confirms Five Cases Of Hantavirus