The unemployed 30-year-old suspect was arrested on an international arrest warrant on Sunday at Calais port as he prepared to illegally travel to the UK.
The crimes in question – two counts of murder (one consummated, one attempted) as well as aggravated robbery – took place on 16 November 2015 in Serra de Santo António (Mira D’Aire) during a drug trafficking deal.
The man was due to face French authorities this week before being handed over to judicial and police authorities in Santarém.