The only defense witness for convicted child abuser, Timothy Foxworth, is now facing his own charges.
John Lloyd surrendered to Bay County Sheriff's Deputies this weekend on a perjury charge.
Authorities said Lloyd lied about being an expert, when he testified in the case of Foxworth earlier this month.
"During the trial we started to get suspicious of things that were said by Lloyd, certifications he claimed and testimony he gave," said Albert Willis, a criminal investigator with BCSO.
Lloyd is a member of the Juris Pro Expert Witness Dictionary, a service for attorney's looking for experts in particular fields.
He claimed to be a professor of medicine at the University of South Florida, and has testified in other cases, involving brain injury and shaken baby syndrome.
But, investigators said he is not on the faculty at South Florida.
They also said they do not buy his testimony, supporting Foxworth's story that the brain injuries his 10-week old son received, could have happened in an accidental 2 ½ to 3 foot fall.
Authorities believe Lloyd's testimony may have helped convinced jurors to find Foxworth guilty of child abuse, which carries a 5 year sentence, instead of aggravated child abuse, which carries 30 years.
"Absolutely, it did affect the length of time he was likely sentenced to," said Willis.
"There is no way to know exactly what the jury found without evidence. Who considered it trustworthy and reliable,” said Jennifer Hawkins, the assistant state attorney. “We think it did obviously have an impact on the outcome of the trial."
If convicted of perjury, Lloyd could face up to five years in prison.