I didn't say I killed it did I? my girlfriend was driving to work....Im on your side let it be.....can you tell me what kind it is? but since you're a hippy tree hugger I'll delete my post. thanks for the childish answer.
In the spirit of Trans Atlantic co-operation and brotherhood I thought I'd have a go at identifying the spider anyway. It looks like a gravid female, possibly a Sac Spider of some sort. I can't get much closer than that from the photo. I hope your girlfriends car isn't a Mazda. You have probably heard about the Yellow Sac Spiders personal crusade against them. It is wise to be a little careful with the afore mentioned fellows as they can give a bite and their venom has necrotic properties.