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A prelude to attempting to stoke division. officials say iran may be trying to build on tactics employed two years ago using bogus social media accounts. they tried to link to far right groups. now to the murder of that off-duty sheriffs deputy in houston, killed during an attempted theft of a catalytic converter of his vehicle. the precious metals inside a major target for thieves. here's transportation correspondent gio benitez. >> reporter: tonight, the attempted theft of a pricey car part in a houston neighborhood leading to the death of an off-duty sheriff's deputy. he and his wife were...

>> reporter: the department just started using this immersive virtual reality system. >> got one down. >> reporter: it can simulate the toughest things cops face. like how to deal with their own implicit bias, when to use force and when to back away. >> we can end this thing at a non-lethal level, that is a win/win for everybody involved. >> we tried the system. >> reporter: sir, i would like to see your hands. >> my hands are right here. >> reporter: and it becomes very real, very fast. sir, stay in the car, stay in the car. my response during the simulated traffic stop was to draw my gun whe...