Prosecution seeking death penalty
But Oklahoma County District Judge Susan Stallings is allowing prosecutors to put on evidence linking him to three other deaths in Texas.
In an opening statement, Assistant District Attorney Ryan Stephenson told jurors Reece admitted choking Johnston in his horse trailer at the car wash after she yelled at him for spraying her.
The prosecutor said Reece confessed to raping her, too, stopping because it was too hot. He confessed to choking her with his hands and a rope after she hit him with a horseshoe.
Johnston was 19.
Prosecutors are seeking the death penalty.
DNA links defendant to Oklahoma crime