Murdered deaf man Robert Wright's sister is worried his autistic and intellectually disabled killers will get away with throwing her brother off a Melbourne balcony because of their special needs.
Jake Fairest, Georgia Fields and her ex-boyfriend Warwick Toohey were found unfit to stand trial over the 2015 murder of Robert Wright.
Toohey, 30, and Fairest, 27, are intellectually disabled while 20-year-old Fields suffers from atypical autism and has low intelligence.
All three are profoundly deaf, as was their victim.
In October, a jury in a special hearing found the trio had murdered Mr Wright in January 2015 by throwing the 36-year-old off the balcony of the Ringwood unit he shared with Toohey.
Fairest and Fields, who have been free on bail since the murder finding, returned to the Victorian Supreme Court on Friday for a hearing about whether they should be given a custodial or non-custodial order.
Toohey was given an indefinite custodial supervision order in February for his part in the murder and will spend at least 25 years at a residential facility overseen by the Department of Health and Human Services.
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Mr Wright's sister, Leanne Power, said Fairest and Fields should not be allowed to remain free.
"I believe that jail is the best option for them," she told the court.
The trio killed Mr Wright - who had epilepsy and cerebral palsy, and did not have full functionality in his left leg - because they wanted his unit for themselves.
Fairest, Fields and Toohey were captured on camera telling each other through sign language it would be "easy" to make Mr Wright fall to his death and "splatter".
Mr Wright fell 12 metres about half-an-hour after the murder plot was captured by CCTV cameras on a Ringwood-bound train on January 15, 2015.
"If they can do this to him to get him out of the way, what will they do to someone else who gets in their way?" Ms Power said.
She does not believe Fairest and Fields can be rehabilitated, and is worried they will be allowed to avoid custody because of their special needs.
"What message does this send to the community - 'If I have a disability, I can get away with things?'" she told the court.
The hearing before Justice Jane Dixon continues.