Three men accused of brutally murdering Perth brothers Jake and Callum Robinson in Mexico last year could face a combined sentence of 600 years behind bars after rejecting plea deals.

Jesus Gerardo, Irineo Francisco and Angel Jesus faced court in the Mexican city of Ensenada on Thursday local time charged with aggravated homicide, aggravated robbery, violent robbery and grant theft auto over the fatal shooting in April last year.

Callum, 32, and Jake, 31, were on surfing holiday and had been camping in a remote part of northern Mexico with their American friend Mr Rhoad, 30, when they were each shot in the head during a botched robbery.

Authorities confirmed the trio were killed after they tried to de-escalate the situation when the robbers ambushed them to steal the pick-up truck they

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