The juror, it seemed, was texting.
Marion County Circuit Court Judge Dennis Graves cleared the courtroom and excused all jurors except 26-year-old Benjamin Kohler.
According to a press release from the Marion County Sheriff's Office, Kohler had no explanation for his actions.
Jurors in Oregon are given explicit instructions at the outset of each trial not to use cell phones during court.
Graves held Kohler in contempt of court. Kohler spent most of Tuesday and Wednesday in the Marion County Jail.
He was released late Wednesday night.
Neither the nature of his text message nor its recipient was disclosed.