A three-member panel of the state 2nd District Court of Appeal affirmed Spector's conviction in a strongly worded, 81-page decision rejecting a number of claims made by his defense attorney.
Spector is serving 19 years to life for the 2003 death of actress Lana Clarkson at his Alhambra mansion.
The judges also dismissed the contention that Clarkson was despondent and might have killed herself with a gun at Spector's home. In making that ruling, the panel pointed to evidence from her mother that suggested Clarkson was hopeful about the future.
The court ruled that it was permissible for prosecutors to call several women who said Spector had threatened them with guns in the past.
Spector's defense attorney said that testimony was inflammatory, and he will seek a re-hearing before the court of appeal.
The Associated Press contributed to this report.