Checkmate was a detective television series starring Anthony George, Sebastian Cabot, and Doug McClure. The show aired on CBS Television from 1960 to 1962 for a total of 70 episodes. It was produced by Jack Benny's production company, "JaMco Productions".
Gold Key produced two issues of the comicook tie in. Here is a story from the 2nd issue, cover dated December 1962 and drawn by Jack Sparling. Script was mostly likely by Paul S. Newman.
Here are the two "Info Pages" from this issue.