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Update on 'The Worst Predator'

Update: Last August, Dateline brought you a report on Dean Schwartzmiller -- a man police believe is the worst sexual predator of our time.

Despite seven arrests, four convictions (two overturned on appeal), and an outright acquittal, Schwartzmiller remained free until last May. This time investigators found something new: spiral bound notebooks with what appear to be coded entries, believed to be a ledger recording thousands of assaults.

During his trial, Schwartzmiller acted as his own attorney, telling jurors he was innocent and maligned by a society that doesn't accept men who love boys.

Today, he was sentenced to 150 years in prison.

The judge in the case says that despite his legal savvy in getting previous charges dropped, he now will spend the rest of his days filing appeals from a prison cell.