Right before Thanksgiving in 1991, Omaima Nelson and her husband took a trip to several states, including Texas and Oklahoma. On their way back to California, Nelson claimed her husband abused her and threw her cat out of the window of their car. Nelson claimed he also handcuffed her to chairs and sexually abused her.
A psychiatrist who testified during the trial said Omaima Nelson was psychotic and suffered from post traumatic stress disorder.
Mooney said he believes Nelson killed because of the abuse she suffered 20 years ago, and now deserves parole.
However, the parole commissioners took into account many different factors, including the prison's recommendation and Nelson's record at the prison.
The case is listed as one of the 50 most notorious crimes in Orange County history.
ABC News' Melissa Morrissette and The Associated Press contributed to this report.