A woman has been arrested over the death of a 56-year-old non-verbal man with Down syndrome. (HANDOUT/QUEENSLAND POLICE SERVICE)A woman has been arrested over the death of a 56-year-old non-verbal man with Down syndrome. (HANDOUT/QUEENSLAND POLICE SERVICE) Credit: AAPA 70-year-old woman has been charged with murder, almost three years after a "severely malnourished" man weighing 29kg was found dead. Maria Concepceion Arrieta was arrested on Tuesday following a "complex" investigation into the death of Isaac Oar, a 56-year-old non-verbal man with Down syndrome. "Isaac was found seriously malnourished - he was only 29kg at the time of his death," Detective Inspector Jason Shepherd told reporters in early 2025.