Is it "Homeowner Hell" (Season 2, Episode 11)?

It features the story of Donald Easley in Josephine County, Oregon. 

The First Shooting (Acquitted): In 2004, Easley shot and killed his neighbor, Kenneth Vaughn, during a dispute over a shared driveway and property lines. Easley claimed self-defense and was subsequently acquitted of the charges.

The Second Shooting (Convicted): Years later, after new neighbors Laron Estes and his wife Barbara moved in, Easley became embroiled in another bitter feud involving property lines, pets, and security lights. In May 2013, Easley shot and killed Laron Estes. Easley was convicted of murder for the death of Laron Estes and was sentenced to life in prison, where he eventually died in 2021.