Speaking after Gu Kailai's sentence, court official Tang Yigan said that Gu and family aide, Zhang Xiaojun, had told the court they would not appeal their sentences.
Tang said Gu told the court that the verdict was "fair and it shows special respect for the law, reality and life."
He also said that the court had considered Gu's testimony against others, her confession and repentance, and her "psychological impairment" as mitigating factors in sentencing.
But he said it rejected claims that Heywood's threats had prompted the crime, saying there was no evidence he intended to make good on them.
Gu Kailai could be freed from jail within 10 years after being found guilty of killing British business consultant Neil Heywood.
A Chinese court has given Gu Kailai, the wife of ousted politician Bo Xilai, a suspended death sentence for the murder of Neil Heywood.
China's most politically explosive trial in three decades has ended after just one day as Gu Kailai did not contest charges of murder.