Some of the findings of a recent UNC study:

72% of all executions carried out in Florida between 1976 and 2014 were for crimes involving White victims despite the fact that 56% of all homicide victims are White.

Only 26% of all homicide victims are female, but 43% of all executions carried out in Florida were for homicides involving female victims.

Homicides involving White female victims are 6.5 times more likely to result in an execution than homicides in involving Black male victims.

No White person has been executed in Florida for a homicide involving a Black victim. In contrast, 71% of the executions carried out against Black inmates were for homicides involving White victims. In cases where Black inmates were executed, 56% of all of the victims were White.

pdf here