The still you saw was digitized by Matheo Dominicus. It is taken the from the crucial scene in "Convicto" where the young punk allegedly murders the unarmed police officer.

The story of Convicto

"Convicto" is a short (5 min.) music film directed by Raza Zaidi based on and featuring the song of the same title by jbp and performed by the underground Mexico City band Los Antos.
Featured in the still are: Dave Sanner as the accomplice at left, Dan Miller as the fatally wounded cop, and John Pike as the convict.
Other stars in the film include:

I will try to link up to the film right here.