Guy who ran over robber 3 times now charged with murder

Here's something for you guys to debate.

The situation: A man & his wife stopped at Primo's Pizza about 9:45 pm last Friday night on the way home from work. The man owns a tattoo place right down the street. The wife waits outside for him so she can smoke. A young man grabs her by the throat & tries to stab her in a robbery attempt. The man inside sees what is going on & runs outside & fires his gun twice..once in the air & once towards the young man. The young man takes off running down the side street. The man jumps into his Tahoe & takes off after him down the street. The young man goes in the ditch trying to cut across a lot. The man goes off the road after him & runs over the young man, backs up over the young man & runs over him again (runs over him 3 times.) The owner of Primo's called the police (the police sub-station is only a couple of blocks away) & they are there within 2 minutes. The man is charged with assault with a deadly weapon. Three days later the young man dies & now the man is charged with first degree murder.

What are your opinions? What would you do if you saw your wife being attacked?

I used to work only 4 blocks down the street from where this happened.

Here are some links:

http://www.fayobserver.com/article?id=286942

http://www.fayobserver.com/article?id=286931