Jason Risenburg faced a murder charges for the 2012 death of 31-year-old Beth Spaulding-Risenburg.
A sentencing date has not been set, but the Jason faces up to 11 years in prison for giving his spouse a lethal dose of methadone.
In early 2013, Risenburg waived extradition from Graham, N.C., so he could be brought back to Sandusky County to face charges in the case.
The Sandusky County Coroner said toxicology results from Spaulding-Risenburg's autopsy revealed she had lethal levels of methadone in her system. Methadone was a drug that Fremont police said was prescribed to her husband for back pain.
During their investigation, police also discovered that Spaulding-Risenburg had been hospitalized once before for consuming methadone, but the incident was not reported because her husband claimed it was an accident.