Published: Mar 03, 2014 3:06 PM EST
Updated: Mar 03, 2014 7:20 PM EST

LEE COUNTY, Fla.- Andrew Castor was sentenced to life in prison today for killing Bianca Interiano in 2008.

Castor was found guilty of first degree murder, grand theft of an automobile and burglary.

The judge sentenced Castor to five years concurrent for grand theft, and another concurrent life sentence for burglary with assault.

The State said Castor is guilty of murder because he formulated a plan to end 20-year-old Bianca Interiano's life. Meanwhile, the defense said Castor was in such a depression that he was insane when he stabbed Interiano to death.

Interiano's father Mike Serrano spoke at the sentencing hearing. He says while justice was served, they will never have closure.

"It's not easy for her family in this case. But we got justice and I hope Andrew one day will recognize his mistake," he said. "Really hard. Not to have my daughter in the house, to talk to, to enjoy, go out, have a dinner all together. She was a good kid, I'm proud of her."

As a man of faith, Serrano says he has no ill will toward Castor, but wants to know why Castor took his daugther's life. "I feel sorry for him. He's a young kid, I don't have nothing against him. But one day he's going to have common sense himself, he's going to ask himself why."

He says he misses the little things about his daughter. "She was my handyman in the house. She would do all the repairs in my house. That's the most that I miss her. One day, we're going to see her. In heaven."

Terrance Lenamon, Castor's attorney, says, "the only thing we know is what he told the psychiatrist and that's he had an intense feeling of anger and hatred, some of it tied to his abusive mother. And he just went in there and killed her. I think he wasn't acting in his right state of mind at the time." He also added, "he's very grateful to the victim's family..because this originally was a death penalty case and I think they played a very significant role. Their tie to religion and their belief in God played a significant role in them taking the death penalty off the table in this case."