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Spector's lawyer is asking the judge to lower the sentence for using a gun, from four years to three years. The murder conviction alone carries 15 years to life in prison, making the total sentence at least 18 years.
Jurors had the option to convict him of involuntary manslaughter, but after nearly 30 hours of deliberations last month, they decided on the more serious charge of second-degree murder.
In a sentencing memorandum filed Wednesday, defense lawyer Doron Weinberg wrote that the evidence presented at trial "did not establish defendant's culpability for the murder of Lana Clarkson."
Spector has steadfastly denied that he killed the 40-year-old Clarkson who had recently begun working as a VIP hostess at the /*House of Blues*/ in West Hollywood.
City News Service contributed to this report.