OK has had a so-called Castle Doctrine law for about 20 years.
I can find no case in the past 20 years where any OK citizen was prosecuted for a righteous shooting under this law. BTW: Unlike most other states: In OK the prosecutor is not required to take the case to a grand jury. The Comanche county prosecutor recently declined to take two shooting cases, one fatal, to a grand jury.
This case is typical:
http://www.miaminewsrecord.com/articles/2007/11/02/news/news1.txt
"Jack Doughty, 62, stood accused of shooting David Gudde in the early morning hours of July 1.
According to police reports, Doughty operated a fireworks stand out of his Delaware County home in June and early July. Doughty told authorities that he was awakened around 4 a.m. on July 1, by what he believed to be intruders.
Gudde and 18-year-old Lance Stick were reportedly in Doughty's home and were opening an inside door when Doughty fired a shot in the direction of the door with a .22 caliber rifle.
Doughty told investigators that he chased the intruders as they ran outside, firing two more shots to “alert neighbors”.
When authorities arrived at the scene, they found Gudde lying on the ground outside Doughty's home.
An Oklahoma law passed in 1988, protects residents from being prosecuted for using deadly force against suspected threats to themselves in their homes and on their properties.
After investigating the incident, Wyant said he will not file charges against Doughty because is actions were in accordance to the “Make My Day” law.
“With the number of residential burglaries, I am really surprised more people don't get shot for breaking into people's houses with this law on the book,” Wyant said. “I hope people realize the risk they put themselves into when they unlawfully enter someone's house.”"