The Good Samaritan was mentioned by Nacho when Mike Ehrmantraut asked why his truck robbery wasn't in the papers when Nacho says that The Good Samaritan released Ximenez Lecerda from captivity. It turns out that Hector Salamanca shot The Good Samaritan to death when Ximenez calls him over, and buried his body. Nacho doesn't tell Mike where it is.
After Daniel Wormald and Mike's final pill exchange with Nacho, Mike asks Nacho where The Good Samaritan's body is located, offscreen. Nacho tells him where it is. ("")