Key facts
- Charged person
- Maria Concepceion Arrieta, 70
- Victim
- Isaac 'Ike' Oar, 56, half-brother
- Charge
- Murder (domestic violence)
- Date of death
- August 10, 2023
- Location
- Alice Street, Ayr, Queensland
- Weight at death
- 29 kilograms
Background
A 70-year-old Queensland woman has been charged with murder after her half-brother, who had Down syndrome and was non-verbal, was found dead inside a home in 2023 weighing just 29 kilograms.
Maria Concepceion Arrieta, who lives in Forest Lake in Brisbane's south-west, was arrested by police on Tuesday following a 'complex' three-year investigation into the death of Isaac 'Ike' Oar.
Mr Oar, 56, was pronounced dead at an Alice Street address in Ayr, south of Townsville, on August 10, 2023. Police established a crime scene and commenced an investigation.
Current situation
Arrieta was charged with one count of murder (domestic violence) and was remanded into custody. During a brief hearing at Brisbane Magistrates Court on Wednesday, the court heard she currently works as a disability support worker.
Her lawyer, Mathai Joshi from Connolly Suthers Lawyers, requested the matter be transferred for mention at Townsville Magistrates Court on August 7. A brief of evidence was ordered to be disclosed to the defence by September 30.
Queensland Police said investigations into Mr Oar's death had 'been complex, with detectives conducting extensive and thorough inquiries into his health, care, and treatment throughout his life.'
| Detail | Value |
|---|---|
| Charged person | Maria Concepceion Arrieta, 70 |
| Victim | Isaac 'Ike' Oar, 56 |
| Charge | Murder (domestic violence) |
| Date of death | August 10, 2023 |
| Location | Alice Street, Ayr, Queensland |
| Weight at death | 29 kilograms |
Impacts
The case highlights concerns about the care of vulnerable adults with disabilities. Police alleged Mr Oar's condition stemmed from years of neglect and named his primary caregiver, his older sister, as a person of interest.
Detective Inspector Jason Shepherd told reporters in 2025 that Mr Oar was 'found seriously malnourished - he was only 29 kilos at the time of his death' and had not received professional medical treatment in well over a decade.
Police believe people who had contact with the family or the house in the years before his death may be able to assist the investigation.
Future outlook
Scenario analysis: The possibilities below are not certain predictions.
The case is scheduled to be mentioned at Townsville Magistrates Court on August 7. If the matter proceeds, the defence will receive a brief of evidence by September 30, which could shape the legal proceedings.
Depending on the evidence, Arrieta could face trial if the court finds sufficient grounds. The complexity of the investigation suggests that further details about Mr Oar's care and treatment may emerge during the legal process.
If convicted, Arrieta could face a significant prison sentence. However, the outcome remains uncertain until the court reviews the evidence.
Source: dailymail.com
