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When someone is killed during the commission of a crime, if the person killed is one of the parties that is involved in the crime, the person committing the crime is guilty of murder. So, since the man in the car was committing a crime, the woman in the car became an accessory to the crime. When the woman died as a result of the actions evolving from the crime, the man in the car becomes the actor charged with her death.

For example, three kids are riding in a car. One of the kids gets involved in a drug deal. The deal goes south, the kid draws his weapon, and the other party to the drug deal then draws his and shoots. If one of the kids in the car dies as a result, the kid involved in the drug deal will be charged with that kid's death.

The shooter could also be charged, depending upon the facts of the case, but the husband is guilty already merely by having been the person who precipitated the events that led to her death.

That's my non-lawyerly take on the law.