The Pirates optioned Murdock to Triple-A Indianapolis on Tuesday.
Murdock made two appearances for the Pirates after getting recalled July 29. He pitched a total of three innings and allowed no runs on three hits and a 4:3 K:BB. He's getting sent down to help make room for Lake Bachar, Luke Weaver and Kirby Yates, who were all acquired in trades Monday. Brandon Eisert was also optioned to Triple-A Indianapolis on Tuesday.