NIPSEY HUSSLE MURDER CASE ERIC HOLDER'S ATTORNEY QUITS .

Nipsey Hussle's alleged murderer is going to need a new lawyer -- Christopher Darden is quitting the case ... and it sounds like a wave of death threats to him and his family were just too much.

Darden says he's filed a motion to withdraw as Eric Holder's defense attorney. Holder happens to have a hearing scheduled for Friday in L.A. Superior Court, and Darden says it's the last time he will appear in court on the case. 

Darden, who famously prosecuted O.J. Simpson in his double murder trial, says he's received death threats since taking Holder's case -- and the flood of hatred reminded him of the O.J. case. As he put it, "Just as they were in 1995-Cowards never change. These days these cowards don’t send letters instead they sit anonymously behind keyboards threatening a man’s mother and children."