A jury found Samuel Gideon guilty of voluntary manslaughter, and the 36-year-old man will spend the next decade behind bars.
The voluntary manslaughter conviction means jurors believed Gideon acted in the heat of passion when he stabbed 20-year-old Eleazer Herrera in Jan. 2012.
The prosecution said that Herrera was a Good Samaritan who pulled over to help out after seeing Gideon involved in a car wreck.
However, the defense disagreed, and said a fight broke out after that wreck and that Gideon was defending himself against Herrera who was trying to fight him.
The second man accused, Christopher Todd Rochelle, is being tried separately.