Detective Rod Wheeler, former DC Washington homicide detective, commented on the case and said because knives were used it might point to it being a person of Latin descent committing the crimes (knives and blunt force trauma). He said that typically in that area (DC, Maryland, Virginia) handguns are the weapon of choice. I have no clue. He said the 48 hours leading up to the murders is more important in this case. ? If you read comments some people believe it is a woman. I can't tell diddly squat. He also said that the housekeeper that was killed lived New Carollton, Maryland only a couple of blocks from where the car was set on fire, which also happened to be close to the iron works business.
If the latin descent part is true, maybe this person was there who knew the maid and planned it with her or without. Maybe it was this maid who was given CPR and still alive. Maybe she did not get stabbed or hit because this person knew her. He set fire, left real quick and she might have gotten smoke inhalation which killed her.