I went looking for data to refute this, because it didn't seem right to me. But, looks like you're correct here. According to the Bureau of Justice Statistics

I went looking for data to refute this, because it didn't seem right to me. But, looks like you're correct here. According to the Bureau of Justice Statistics [0], among all state-level prisoners, 14.3% of them are in for murder, and 13.1% are in for rape. That's 27.4% for the combination, or about 350,000 inmates. 106 per 100,000. If you add in Federal prisoners, the inmate count goes to ~370,000, or about 112/100k [0] https://www.bjs.gov/content/pub/pdf/p18.pdf https://www.bjs.gov/content/pub/pdf/p18.pdf (PDF, see table 13, page 21.)