How do I deal with a tragic death?

My grandfather’s killer is facing a minimum of 7 years for running him down with a stolen car.

I am not sure how to feel. I know I have to stay strong for my children, but how do I do that when all I want to do is break down and cry.

My grandfather, James Lewis Sr., was an extraordinary man. He had no known enemies. He was well liked in his community and helped out anyone that needed a hand. He never asked for anything in return.
His killer, Victor Flores, stole a car in the early a.m. from a sixteen year old boy. He drove down the street trying to hit moving cars. My grandfather was two blocks from home, walking to meet up with his friends for their daily coffee at a McDonalds three more blocks down. Victor saw my grandfather jumped the curb and gunned for him. My grandfather turned and tried to run. It was over; and grandpa was left dead, on the parking lot floor. Victor returned the car to the place where he stole it and hid from the police in some nearby bushes.
The police found him, asked the teen if this was the man who stole his car. Of course it was. There was also a call made in to 911. Another man called in, because a man (Victor) driving a car tried to hit him head on. The driver side door was open, so he was able to get a good look at the driver. The car had a busted windshield and a lot of front end damage to the hood and bumper (from where my grandfather hit it). He also identified the man driving as being none other than Victor Flores.

The state offered Victor a plea bargain… 7-10 ½ years for killing my grandfather, 3 years probation for leaving the scene of a homicide, and they will drop the carjacking. Victor is taking the deal…

I am so confused as how to feel.