'Those transactions, regrettably, were never investigated by the police,' he said.
After Dawson's arrest on Wednesday, his family released a statement claiming Lyn was alive after she 'left Chris and their daughters'.
'We are disappointed at the decision of the DPP as there is clear and uncontested evidence that Lyn Dawson was alive long after she left Chris and their daughters,' the statement reads.
'We have no doubt whatsoever that Chris will be found not guilty as he is innocent.'
Mr Walsh said there was a possibility Lyn consciously left her husband and children.
'While it seems most unusual that a lady like Lyn Dawson would disappear and not have contact with her children... it has happened,' he said.
'He doesn't know if his wife is still alive,' Mr Walsh said of his client. 'He is naturally anxious and stressed about the situation.'