........yeah, agree with you peeps^^^, NOTHING about this story adds up. So here's what I think.
I think some kind of prior relationship/acquaintance existed between these two. Now that could have been a "hostile" acquaintance or it could have been "intimate". But this boy was NOT just some random negro to this female cop. Now the stories I'm reading say that Dallas PD have handed over to the Texas Rangers the investigation of this matter. And that DPD will be pursuing "manslaughter" charges against her.
But I would not be surprised as this investigation proceeds that they might pursue more serious charges. Meanwhile, this poor boy's mother and the rest of the family are at home on the Caribbean island of St. Lucia, in shock and in grief, wondering WTF happened?