Cold-blooded murderer Bryan Kohberger is attempting to befriend notorious serial killers nationwide while he serves multiple life sentences for slaughtering four University of Idaho students, a new report claims.

The quadruple murderer, who turned 31 behind bars last month, has been reaching out to other high-profile inmates from inside his cell at the Idaho Maximum Security Institution in Kuna, according to Chris McDonough, a retired homicide detective with the Cold Case Foundation, Fox News Digital reported.

“He’s tried reaching out to other serial killers, but I don’t know whether any relationships have formed,” McDonough told the outlet, citing a trusted source.

“Both inside and outside — he’s trying to communicate with people outside the walls.”

The veteran investigator added t

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