Audio obtained of Tupac Shakur murder suspect's jailhouse call

On an audio recording of a phone call, suspect Duane Davis and his son can be heard discussing what prosecutors allege was a plot to harm their cooperating witnesses.

In a newly obtained audio recording of a jailhouse phone call from the man charged with orchestrating the killing of Tupac Shakur, suspect Duane "Keffe D" Davis and his son can be heard discussing what prosecutors allege was a plot to harm their cooperating witnesses.

In a portion of the two-minute and 16-second audio recording, obtained by ABC News affiliate KTNV, Davis can be heard in a conversation with his son, in which the term "green light" is used.

Prosecutors have claimed in court documents that "in [Davis'] world, a 'green light' is an authorization to kill." which "caused enough concern that the Federal Government stepped in and provided resources to at least [one witness] so he could change his residence."

On the call, Davis' son can be heard saying he's "got some s--- to tell" his father.