When the motive of the perpetrator was known, what percentage of murders have stemmed from sexual assault?

E.

After the latter half of the 1980’s, the percentage of all murders with known circumstances in which\investigators identified rape or another sex offense as the principal circumstance of the murder has declined from about 2% of murders to less than 1%.

Sex Offenses and Offenders: An Analysis of Data on Rape and Sexual Assault