David Boyd, 65, was sentenced Thursday, July 16, to life in prison after being convicted on five felony charges connected to the repeated sexual assault of two young girls over several years, according to prosecutors.

Diagram of basement holding area, drawn by one of the victims Complaint

Boyd was convicted of two counts of repeated sexual assault of the same child, along with child abuse, trafficking of a child and false imprisonment.

Basement where victims were chained Complaint

Prosecutors say the assaults began when one victim was five years old and the other was eight, and that Boyd physically abused the girls when they resisted and confined them in his basement. He would repeatedly threaten to kill one of the girls, using a knife to cut her body.

"This is the most disgusting non-homicide case I've seen in my career," the prosecuting attorney said in Thursday's sentencing hearing. "The defendant needs to be punished, needs to be removed, and feel a fraction of the pain of both of the girls at his hands, which a max sentence would do."

Authorities learned of the abuse earlier this year after one of the girls disclosed it to her foster parents, according to prosecutors.

"In 30-plus years of doing violent crime, I sit in homicide and sexual assault court. The facts I heard in the course of this trial were some of the most heinous, horrible, brutal facts I've ever listened to," Milwaukee County Judge Laura Crivello said. "Not only did you perpetrate and engage in repeated acts of raping these little girls, but then you brought in men to do it to them as well. And you were a person of trust."

Boyd was sentenced to the maximum amount of time, 115 years. 

"Maybe if you showed some remorse, maybe if you took some responsibility of the heinous acts you did, maybe we'd be at a different point today, but you're not. You've taken no responsibility for your behaviors," Judge Crivello said.

CBS 58