Some govt studies:
Wives are acquitted of murdering their husbands at 5 times the rate that husbands are (6% husband acquittal, 31% wife acquittal)
Spouse Murder Defendents in Large Urban Counties 59% of spouse homicide were husbands, 41% were wives
Number of spouse murder defendants and their demographic characteristics
In 1988, the justice system in the Nation's 75 largest counties disposed of an estimated 540 spouse murder cases. Husbands charged with killing their wife outnumbered wives charged with killing their husband. Of the 540, 318 (or 59%) were husband defendants and 222 (or 41%) were wife defendants.