HBO 'Spector' Director Warned -- Don't Glorify a Killer!

6/16/2011 3:00 AM PDT BY TMZ STAFF
David Mamet -- the guy directing the upcoming HBO flick about Phil Spector -- ignited a firestorm after publicly claiming Spector is innocent of murder ... and now the victim's friends are horrified that Phil "will be portrayed with some kind of sympathy."

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Friends of late actress Lana Clarkson were FURIOUS this week when Mamet told the Financial Times, "I don't think [Spector] is guilty. I definitely think there is reasonable doubt ... they should never have sent him away ... If he'd just been a regular citizen, they never would have indicted him."

Now, Clarkson's friends have banded together -- and have fired off a letter to the director, claiming his comments were "mind-boggling and wrong in so many ways."

According to the letter, obtained by TMZ, the group's main concern is that "the loathsome, lying, gun-abusing convicted murderer of our friend Lana Clarkson will be portrayed with some kind of sympathy."

Lana's friends want to remind Mamet -- whose upcoming film stars Al Pacino and Bette Midler -- that Spector was CONVICTED by a jury of his peers ... and plead, "Please refrain from rewriting history for 'creative license.'"

Spector is currently serving 19 years to life in prison for murdering Lana in 2003.