During his sentencing hearing, Sean Cave he's sorry for all the pain he put the victim and her family through.
A judge sentenced Cave to two life sentences for the robbery and assault and 50 years for armed criminal action.
Cave stabbed Kim Dejonge in the throat seven times during a robbery at a Winthrop convenience store in June.
Dejonge survived the attack.
The sentence was a relief for the 19 year old.
"It's just been a long time coming," said Dejonge Just for it to finally be over and no more hearings for it and knowing he'll never be out again is a great feeling."
A second suspect, Letah Gerdes, also faces robbery charges.
She's accused of driving the getaway car.