The parents of Stuart Kelly, who took his own life after his brother Thomas was killed in a one-punch attack which sparked NSW's contentious lockout laws, have revealed their 'greatest regret'.
Ralph Kelly, 59 and wife Kathy, 56, reflected on the death of their sons in an interview with Women's Weekly.
They said the death of Thomas, who as fatally coward-punched by Kieran Loveridge, 19, in Sydney's Kings Cross seven years ago, had a devastating effect on Stuart.
'It's clear to us now that Stuart was even more deeply affected than we knew,' Mr Kelly said.
'That is our greatest regret, that we didn't recognise the signs.
'In hindsight we can say that there were signs but we simply didn't see them for what they truly were.'
The parents of student Stuart Kelly (pictured), 18, who took his own life after his brother Thomas, also 18, was fatally coward punched have revealed their 'greatest regret'
Ralph and Kathy Kelly (pictured), 59, and 56, lost two sons in four years. They now have one surviving child Madeleine who is 23
Mrs Kelly felt she 'let her son down' and shared her husband's regrets.
'I don't think I experienced the same grief, the same intense feeling of grief, when Stuart died,' Mrs Kelly said.
'It took me a while to realise how I felt and for me to begin the grieving process again.
'Perhaps I let him down, but I have tried to make up for that since.'
The parents have one remaining child, Madeleine, 23, who was motivated to study law after Thomas' killer was given a lenient sentence.
Stuart and Thomas Kelly would be 21 and 25 respectively today if not for their untimely deaths.
