The British couple who were poisoned by Novichok had sprayed a container disguised as perfume that later broke in the man's hands when they were contaminated with the military-grade nerve agent, a family member said.
In March, Russian former spy Sergei Skripal and his 33-year-old daughter, Yulia, were poisoned with Novichok in the town of Salisbury.
They have since been discharged from hospital.
Mr Rowley, 45, who collapsed hours after his girlfriend, was released from hospital on Friday after intensive treatment for Novichok poisoning.
The investigation believes that potential assassins used a perfume bottle with Novichok to spray the nerve agent on the doorknob of Skripal's house in March. Claiming that the substance used in the attack had been a Novichok-class nerve agent developed in the Soviet Union, London rushed to accuse Russian Federation of being involved in the incident.
Public Health England medical director Paul Cosford has said Mr Rowley's discharge from hospital does not pose a risk to the public.
Ms Sturgess, 44, was killed after spraying herself with a dose ten times as strong as that which was daubed on the door handle of Sergei Skripal's home nearby in Salisbury.
Her sister Stephanie told the hearing she was present when doctors informed her of the decision to switch off her sibling's life support.
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"I can't say anything else about it but I hope the police are able to identify him for her sake".
"I am pleased to confirm that earlier today, Charlie Rowley was discharged from hospital", Lorna Wilkinson, Director of Nursing, Salisbury NHS Foundation Trust, said in a statement.
Rowley, however, will remain under police protection as detectives continue their investigation into how the couple came into contact with the nerve agent.
"They (the investigators) are sure they (the suspects) are Russian".
The Organisation for the Prohibition of Chemical Weapons earlier this week said its inspectors had collected samples in the Amesbury case and were analysing them. She is believed to have been exposed to 10 times as much Novichok as the Skripals.
Last week, it was revealed that investigators had identified, from CCTV footage, Russian nationals that were suspects in the poisoning of the Skripals.
The Metropolitan Police, who are leading the investigation, declined to comment.