30-year-old Daniel Schmidt was convicted of First Degree Intentional Homicide in the deaths of Kimberly Rose and her brother Leonard Marsh.
It took the jury of seven men and five woman just over five hours to reach the verdict.
Prosecutors maintained that Schmidt shot and killed Rose because of her threats to reveal more details of her affair with Schmidt from a journal she kept. Rose also threatened to expose Schmidt's marijuana growing operation because she felt she was shorted some pot used in lieu of a loan payment.
Neither the journal nor the murder weapon, which was determined to be a 20-gauge shotgun, were ever found. Schmidt owned a similar firearm that disappeared shortly after Rose and Marsh were killed.
Schmidt's attorneys say the lack of a firearm, no fingerprints or DNA from Schmidt at the scene or blood on Schmidt's clothing from the day of the killings prove his innocence. They also say the distance from Schmidt's home to Rose's home was too far for Schmidt to commit the crime according to his work schedule and the need to pick up his daughter from school.
Schmidt faces mandatory life in prison. Scheduling for a sentencing date is set for Friday morning.