Investigators said they couldn't have solved a mysterious cold case without the help of reserve Tony Kava.Kava volunteers with the Iowa Crimes Against Children Task Force and with the Pottawattamie County Sheriff's Department as a reserve. He is most comfortable sitting behind a computer, analyzing data and using his coding skills to solve crimes."They looped me in right away because there was such a big digital component of emails and texts," Kava said.The investigators looking into the November 2012 mysterious disappearance of Cari Farver. She disappeared and was never seen again, but her family and friends kept receiving bizarre texts, emails and social media posts."Cari was impersonated in about 12,000 emails that were sent over the years," Kava said.In late 2016, authorities arrested Shanna Golyar for murder. They said Golyar took on Farver's identity after killing her. The motive they said was jealousy over a mutual boyfriend."There were 7500 texts," Kava said. "Millions of records in this case."He said, "It was a never-ending trail that once we started to unravel it we were able to connect together and trace back to the murderer," Kava said.Kava said there was such a large volume of materials, his technology tools couldn't handle it. He developed his own software program to focus the investigation."It was really mapping out a network and at the center of it, you had the suspect and a few accounts here and a few accounts and few accounts connected to her (Golyar)", Kava explained.He said they found at least 60 different email accounts created by Golyar, pretending to be Farver.Kava said he donated around 3000 hours of work on the case, for free. Reserves are paid one dollar year.His hard paid off. The county created a new position in the sheriff's department of digital forensics investigator. Sheriff Jeff Danker said with a rise in cyber crimes, it's time they had a full-time investigator. He said Kava is a perfect choice."You need someone to sort through this and put the case together," Danker said. "It's not typical for an investigator to be trained in and having this specialized knowledge, we are fortunate to have Tony in this position."Kava said not a day too early. "I already have 6-8 case to start working on."Kava said the Internet Crimes Against Children Task Force is back-logged with about a year of cases. He hopes to continue working on those cases, along with his new full-time job.Kava was the county's IT manager.Golyar is serving a life sentence for the murder of Farver. Her body has never been found.