Kieth is Stan Smith's pharmacist.

In "A Smith In The Hand", Stan repeatedly come to him for ointment, purportedly for his burn injury but in reality, using it to masturbate. Keith informs him that he has not only used up his original prescription, but the refill for his refills. In frustration, Stan tries to threaten him with his finger in the shape of a gun because he traded his gun to Keith for more refills.