Which of the following U.S. TV Westerns did not star Dale Robertson?

"Lawman" is an American Western TV series that was originally telecasted on the ABC network from 1958 to 1962, starring John Russell as Marshal Dan Troop and Peter Brown as Deputy Marshal Johnny McKay. The series was set in Laramie, Wyoming, during 1879 and the 1880s. Warner Bros. studio already had several Western series on television when "Lawman" was released.

This is a series that never sought Dale Robertson for a starring role or even tried to use him in any of its 156 episodes. This show is focused on Marshall Troop who is sorely needed as he's tasked with bringing justice to one of the wildest lands of the Wild West.

"Death Valley Days" was an American syndicated Western anthology that aired for 20 seasons, from 1952 to 1970. The show had 5 stars who hosted the TV series. The stars include Stanley Andrews (1952–1964), Ronald Reagan (1964–1966), Rosemary DeCamp (1965), Robert Taylor (1966–1969), and Dale Robertson (1969–1970).

"Tales of Wells Fargo" is an American Western TV series that starred Jim Hardie (Dale Robertson) as a Wells Fargo agent. This series ran from 1957 to 1962 on the NBC network.

"Iron Horse" is an American Western TV series that appeared on the ABC network from 1966 to 1968; it featured Dale Robertson as fictional gambler-turned-railroad baron Ben Calhoun.