The FBI has returned blood test results in the Austin Harrouff case, according to the Martin County Sheriff's Office.
It says the findings are now in the hands of prosecutors.
RELATED: More coverage of the case
The sheriff's office did not say what the results are. It said the State Attorney's Office will handle further inquiries.
Tuesday afternoon, a Grand Jury upgraded the charges from second-degree murder to two counts of first-degree murder in connection with the deaths of Michelle Karen Mishcon, 53, and her husband John Stevens III, 59, of Hobe Sound who were killed on Aug. 15.
Investigators at the time said Harrouff was not on cocaine, pot or opiates during the attack but have not ruled out other drugs.
BREAKING:Assis State Attorney tells us charges upgraded in Austin Harrouff case to first degree murder @WPTV pic.twitter.com/P3basy0u9t
— Gabrielle Sarann (@GabrielleSarann) November 8, 2016
