******* “half-wit” cannot go together with the relative pronoun “who”. Instead it would sound better with either the relative pronoun “which” or “that”. Now, since you meant to use “half-wit” (but didn’t use it properly), the verb “become” is suited in your sentence, no doubt about that and so is “became” and “becomes”. I emphasized the use of “half-witted’ and “became” only because your grammar error with the “half-wit” and “who” combination prompted me to do so.****

There you go. Hope you understand now what I meant. Devika’s “half- wit’ and “who” combination is grammatically incorrect!!!