"This was the definitive statement by a consulting expert that this was a homicide," said Gelman.
The SFPD has been instituting reforms designed to correct problems identified by critics of the de la Plaza investigation. Witnesses were interviewed too long after the de la Plaza death, the victims' friends and family said.
Blood evidence may have been compromised, and both police and the Medical Examiner's office offered unusual explanations for gaps in the suicide theory; for de La Plaza to have committed suicide, he would have had to have either spent his death throes painstakingly cleaning the knife he used, or disposing of it where crime scene investigators couldn't find it.
Until late October, however, few people outside the police department knew of the existence of the independent medical examiner's report, conducted at the SFPD's behest by consultant Michael Ferenc, a former San Francisco medical examiner now working in Marin.
The police department requested the report in Febrary of 2009, Gelman said, a year after the official San Francisco Medical Examiner's report was published stating de la Plaza's cause of death couldn't be determined.
"Nobody knew about this outside the Police Department and the Medical Examiners office, and everybody was kind of stunned by it," said Gelman.
Bill Fazio, a well-connected attorney hired by the de la Plaza family to represent them in dealing with the police, saw the Ferenc report last month, but was unable to obtain a copy.
"I'd like to know where 48 Hours got it," Fazio said. "I wish I had a copy."
SFPD spokeswoman Sergeant Lyn Tomioka hadn't responded to a request for the file by press time.
And Gelman didn't reveal his methods. But he did say CBS will post a copy of the report online in conjunction with Saturday's 48 Hours Mystery episode.
He also didn't reveal all the other tidbits he unearthed in putting together what could be the definitive record of the de la Plaza investigation -- other to say he's put assembled sufficient information for viewers to be "quite satisfied with being able to make their own conclusions."