Found a better source of info at the Detroit Free Press. Apparently the article used cited anther soucred which cited the Detroit News and the Detriot Free Press.
The mother apprently carried the boy out of the house to take him to the hospital but only got as far as the driverway.
Some of the story does not make sense. Boyfriend is a paerson of interest, but shots were fire to a second story bedroom and through a brick wall. I did not know of bullets that could cleanly go through brick walls.
http://www.freep.com/apps/pbcs.dll/article?AID=2014307300104
Must have been an AkR-4715