Scott Johnson tragically died after being caught up in a stage collapse in Toronto last month, while a further three people were injured.
The Thom Yorke-fronted act filled their backing screen with photos of Johnson as they played 'Reckoner' during their third encore in Les Arenes, France, reports Consequence of Sound.
The show was the first of the band's rescheduled dates, which they postponed following the stage collapse incident in June.
Radiohead will continue their world tour with headline sets at Spain's Bibao BBK Live on Friday (July 13) and Portugal's Optimus Alive Fest on Sunday (July 15).
Listen to Radiohead's 'Reckoner' below: