A former operating room technician at Oak Hill Hospital in Brooksville pleaded guilty on Thursday to stealing medication by diluting vials intended for patients, the U.S. Attorney's Office said. From 2003 to 2008, Justin Brian Horan, 26, of Citra diluted 17 vials of morphine and five vials of the sedative midazolam, prosecutors say. Most of the vials were diluted to 10 percent of their original strength, prosecutors said. Horan diluted the vials with a saline solution and reglued caps to avoid detection, the U.S. Attorney's Office said. Horan initially came to the attention of law enforcement for using forged prescriptions to get painkillers from a pharmacy. That investigation led to the case in which he was charged with two counts of tampering with a consumer product. Horan also pleaded guilty to being a felon in possession of a firearm. He faces a maximum of 30 years in prison when he is sentenced later this year.