Ken Johnson, who lives in a small village outside Manchester, England, said he wants "to see people involved and hear what they have to say," the Toronto Star reported Wednesday.
Johnson's father told the Star in a telephone interview he hopes the trial results in lessons for those involved.
"Maybe people should have done some things differently," he said. "Whatever the outcome of the trial, I just hope that it's fair and honest."
He said tuning drums for Radiohead was the pinnacle of his son's career.
"Scott's message in life was to be fair, and none of this is fair," Ken Johnson said. "I still cry every day."