Bondi Junction Westfield killer Joel Cauchi had profiles on various escort websites, where he offered services for both men and women.

Cauchi, 40, was shot dead after fatally stabbing six people and injuring around a dozen others - including a 9-month-old baby- at the eastern Sydney shopping centre on Saturday afternoon.

He was schizophrenic, and police are treating the horrific attack as mental-health related.

His distraught family is understood to have frantically contacted police concerned their son was involved in the Bondi attack yesterday, News Corp Australia reports.

Now, new details are beginning to emerge about Cauchi's life and movements in the lead-up to the devastating mass murder.

Cauchi, who is from Queensland but moved to Sydney in recent months, listed himself on several male escort websites, including Australia Cracker, Empire Escorts and Escorts Australia.

All websites allow users to upload their pictures and solicit their own sexual services.