Okay, I see what you're saying now. If the driver left after the first burglary and did not link back up with the perp, leaving before the perp began the commission of the second offense, one could make an argument that the driver took tangible steps to disengage from the conspiracy and thus the felony murder rule would not apply. This would be particularly true if they had only planned to rob the first house. However, if they linked back up later, the driver will have a harder time making that argument, even if s/he didn't know what the perp planned to do at the Blackburn house. You can be held accountable for things you knew about even if you weren't there, but you can't be held accountable for things that happened after the planned conspiracy that weren't planned and happened after you left. Does that make sense?
So in this case, the driver would not be charged under the felony murder rule if s/he 1) did not plan to rob the Blackburns; 2) did not know of any plan to rob (or worse) the Blackburns; and 3) left before the commission of the offenses at the Blackburn residence had begun. The driver could be charged under the felony murder rule if s/he planned to rob (or worse) the Blackburns, OR even if s/he was not part of that plan, was around for part of the offense. To not be caught up in a murder charge, the driver would have to really not know what was going to happen AND leave before anything got started AND not come back to be the getaway driver. :twocents: