Detectives charged Jerry Pena, 21, Thursday with three counts of aggravated robbery.
Pena was already in custody on unrelated charges when police got the three arrest warrants for him.
They say he helped in the robbery of a Silverado from a Kelly Grimsley Honda dealership.
A couple weeks ago, police arrested Sonny Montez and Ember Lajaunie for stealing the truck.
The robbery happened about a month ago.
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