Olathe ? The wife of convicted serial killer John E. Robinson Sr. has filed for divorce, citing irreconcilable differences and incompatibility.

Robinson, 61, was convicted of killing three women in Kansas and five in Missouri.

His wife, Nancy, who filed for divorce Wednesday in Johnson County District Court, testified at his Kansas trial in October 2002 that she still loved her husband despite his numerous affairs and sadomasochistic sexual preference.

But more than 2 1/2 years after she asked jurors to show mercy on the man she described as a devoted father and grandfather she is calling it quits. The couple have been married for nearly 41 years and have four adult children.

A Kansas Supreme Court decision overturning the state’s death penalty law has called Robinson’s fate into question. Robinson was sentenced to death in Kansas for killing two women whose bodies were found in barrels on his farm in rural Linn County. A Kansas judge also sentenced him to life in prison for killing a third woman whose body was never found. In Missouri, he was convicted and sentenced to life in prison for the deaths of five women between 1984 and 2000.

If the U.S. Supreme Court does not overturn the Kansas Supreme Court ruling, Robinson will spend the rest of his life in prison.