have to keep him here. >> reporter: he isn't the only name for this man. the other, the pillowcase rapist. the monocore for his pension for covering the heads of his victims' heads and raping them. he raped 40 women. he served six years in jail and released in 1979. prosecutors say he then raped another 23 women. after serving two more prison sentences for rape and burglary he was paroled in 1993. part included a psychological evaluation. due to a mental disorder, he had a high risk of reoffending. >> he's in his 60s. do you think he has the same appetite to commit these crimes as before? >> yes, he's non-curable.