Tonight, America’s 15-year love affair with the NBC medical drama “E.R.” comes to a close. The show introduced a lot of actors who became very big stars and today I’m delighted to welcome a young man who is probably hoping he is on the launching pad to become one of them. Audiences first noticed Sam Jones III as Clark Kent’s best friend, Pete Ross, during the first three seasons of “Smallville.” He has since appeared in a number of movies, including Snipes, Zig Zag and Glory Road. More recently, Jones became part of the final group of medical students to go through Chicago’s County General Hospital on “ER.” His character was noteworthy because for 17 episodes he played Chaz, the younger brother of long time “ER” doc Greg Pratt, played by Mekhi Phifer. Sam Jones III • • • • •