Dolores (code: D-005) was a girl born through Mold experimentation by The Connections. She was one of eight children genetically-engineered as embryos to incorporate Mold, becoming D-Type bioweapons. She killed Diana and Daniella along with herself. Her preserved body was sent with Mia Winters on the Annabelle for use in the Connection' new base. When the Annabelle ran aground in a hurricane, Dolores was recovered from the wreckage and was taken to the Baker ranch.
Dolores' identity as D-005 may suggest the murder-suicide was mental or Mold-related, as she appears to have died as a baby.