I'm haunted by my inability to see a headlight on the victim's bike in the media reports. I hope/wish he had a headlight and it was just knocked off and recovered at the site.
But what if the light(s) weren't there? The law (& insurance) will engage in a form of victim-blame-sharing: while this won't absolve the person driving of the "and run" part of the hit, if either vehicle did not have conforming markings (which are the "State Inspection" lights for the car, and for a bike are white headlight, red light or reflector, yellow pedal reflectors or anklets*) mean that things shift away from them.
The estate of the person killed cycling without adequate markings gets less justice--a lighter punishment for the other person operating and a smaller or none or delayed insurance recovery.
Is that a choice people on bikes know they are making when they save [$20 ~ $50] by not having such markings, or [20c ~ $2] by not replacing their batteries? We often say "ignorance of the law is no excuse" but, at least for any licensed activity (gun owning, car driving) we license because nobody really wants anybody to suffer the consequences of that particular ignorance.
Personally, I think it a cruel trick that it is even legal to sell bikes in Massachusetts which lack the headlights required to operate them after dark. I don't think it should be legal for a bike to roll out the door of any bike retailer (at time of purchase or repair), or to be delivered by mail, or resold on craigslist,** without an operable white front light visible at 500 [feet...30% more than a football field w/endzones].
Right now, bike shops must display a copy of the helmet laws, but not (as far as I know) some kind of operating summary of the laws (the massbike one, below, is a good one), and it is the likely-ignorant breach of these laws that are going to be enforced/cited to the great detriment of the person cycling (or his/her estate).
*see
http://www.massbike.org/laws
** maybe used sales could be done with a disclaimer "this bike lacks the headlight required for operation on streets after dark"