 Rettig hoped the plot would be restructured to allow his departure, but producers were content with the status quo, the show was more popular than ever, and it was hoped Rettig and Clayton would reconsider.Producers were forced to overhaul the show when actor George Cleveland died suddenly on July 17, 1957.The plot was revised with new characters Ruth and Paul Martin buying the Miller farm, and becoming foster parents to Timmy and Lassie.