The very fair, slight Anglo-Saxon (5'10") nearing middle age in Showalter-R. was obviously not of the same man as that, and the S-R sketch was DEFINITELY OF THE PERP, while the sketch on the Skyline was just a man that desperate pleadings with hundreds, resulted in just one or two persons saying they had seen, some day that Mem-day weekend in that general area of the SNP, and may well have nothing to do with the case.
In the Modafferi murder, similarly she had been earnestly conversing with a frowzy blonde at a coffeeshop, in that case Spinelli's, so much so that she forgot and left her paycheck behind when she left with Frowze. I have seen news reports that a sketch WAS done, and also that one was NOT done, of that Frowze, but in any event none was ever released to the public SFAIK.