Mr. Turkle works the night shift on the ward, from 11pm to 7am. He is described as "an old Negro man with a big sleepy grin on the end of a long wobbly neck." He seems to spend much of his night shift sleeping because he works during the day at a race track, and he also often smells like he's been drinking. If Chief is having a bad dream, Mr. Turkle will loosen his sheet a bit, as Mr. Turkle thinks that the next aides will think that Chief loosened his own sheet. If Mr. Turkle thinks it will get him in trouble, though, he doesn't dare loosen or untie Chief's sheet.
When McMurphy brings a girl to the ward to visit with Billy, Mr. Turkle lets her in. McMurphy bribes Mr. Turkle with drinks. Mr. Turkle gets so drunk that McMurphy has to feign tying him up with sheets so that Nurse Ratched does not figure out what they have been up to. However, Mr. Turkle is found drunk in the linen room and is promptly fired from working on the ward.