"This man (Coughlin) didn't come forward until 2008," Greenberg said. "Why people come forward for their 15 minutes of fame, I don't know but that's what happened."
Greenberg also said prosecutors have done little to prove that state police investigator Robert Deel botched the initial investigation. Deel concluded at the time that Savio had slipped and fallen in the tub.
"The investigation was properly done," Greenberg said. "Even if you assume there were problems with the investigation, has that led to one shred of evidence against Drew? No."
6:45 a.m. Lead investigator to take the stand
The man who led the investigation into the death of Drew Peterson's third wife is expected to testify today as the former police officer's murder trial enters its sixth day.
Retired Illinois State Police Sgt. Patrick Collins is expected to take the stand as prosecutors attempt to show the investigation he led after Kathleen Savio was found dead in her bathtub in 2004 was botched.
At a hearsay hearing in 2010, Collins said he believed Savio's death was an accident from almost the minute he stepped into her home.
He failed to collect forensic evidence, interview Savio's relatives or secure the suburban Chicago house where her body was found.
Peterson was only charged in Savio's death after his fourth wife, Stacy Peterson, disappeared in 2007. He's denied any wrongdoing.