Guam - Robert Cook may have helped in the conviction of drug kingpin Mateo Sardoma Jr., but it looks like he'll also be spending time behind bars.

Cook, who served as a juror in the federal case, was sentenced to four months behind bars to be followed by one year of supervised release.

Cook pleaded guilty to contempt of court, specifically jury misconduct. Prison phone records show he spoke with a female detainee during the trial specifically about witness testimony, drug evidence, and the status of jury deliberations.

Chief Judge Frances Tydingco Gatewood noted that this is a first ever for the court stating "I've never had a juror who's turned into the defendant for disobeying court orders."

Because of the jury misconduct, Sardoma and co-defendants Rudy Sablan and Maria Edrosa were allowed to enter plea agreements after they were already found guilty by a jury. Although Sardoma would've faced life behind bars, the plea agreement cut that time to eleven years. Sablan was also sentenced 11 years while Edrosa will be sentenced at a later date.