Mr Bishop said he was forced to sit through testimony that crucified his son's reputation, but he could do nothing to protect him.
"They made him out to be someone he was far from, the reporters in the court have to report what was said, so the damage was done," he said.
"I was made out to be Tony Soprano of west Auckland."
The situation was the same for other victims, Mr Bishop said, noting that rape victims in court were often treated in the same way.
The couple welcomed the bill to give greater protection to victims, and suggested several other changes including an overhaul of Victim Support, and annual reviews of judiciaries from outside the legal system.
Mr Bishop also called for all homicide victims to be given the right to a court-appointed legal advocate, who could represent them in any legal appearances for the case.
Labour MP Charles Chauval said one of the problems facing the system was that it recognised two parties, the Crown and the accused.
Dean Browne died after being repeatedly struck over the head with a hammer at his Wellington flat on January 21, 2010. His body was later found dumped in a New Plymouth garage.
Following a trial in the High Court at New Plymouth last year, Mikhail Pandey-Johnson, 23, and Karl Nuku, 19, both members of the Killer Clown Fiends gang, were found guilty of his murder and were sentenced to 18 years' imprisonment without parole.