The female victim is plainly mentioned as "21-yo mother Brianna Benlolo, of College Park"...
My money's on the shooter being the baby daddy, who killed both mom and the new boyfriend.
Apparently the gun was a Mossberg 500 12gauge. If there were 8-10 shots fired, did the perp have the time to reload?
Good LORD! Did you read the comments below on your link?
Hoplophobia seems to be rampant there.