Final answer:
In the book "This is Our Story," Kate saw Grant Perkins with a moving-picture fella before he died.
Step-by-step explanation:
In the book "This is Our Story," Kate saw Grant Perkins with a moving-picture fella before he died. The identity of the person she saw with Grant Perkins is not explicitly mentioned in the given reference, but the passage mentions a "moving-picture fella" who was with Grant Perkins. Therefore, it can be inferred that the person Kate saw with Grant Perkins before he died was the "moving-picture fella."