Mother and toddler’s deaths in South Australia investigated as murder-suicide as hopes for missing baby fade

Police say search for three-month-old a retrieval effort' after bodies of mother Helena Wright and toddler found in the ocean near Port Macdonnell

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Hopes of finding a three-month-old boy alive have faded as South Australian police investigate the death of his mother and sister as a murder-suicide.

The bodies of Helena Wright, 36, and her 23-month-old daughter were found in the ocean off the coast west of Port Macdonnell on Monday.