(Fairfax)- A Fairfax County doctor is facing up to 20 years in prison after pleading guilty to illegally distributing prescription drugs. Prosecutors say that 49-year-old Gurpreet Bajwa wrote 15-hundred prescriptions for controlled substances for over a thousand patients in less than two years. There were so many that some of the pharmacies stopped filling the prescriptions from him. An investigation revealed that he supplied patients with Aderall, Xanax and Oxycodone. He plead guilty yesterday to illegally prescribing six patients, one of which who died from an overdose. He faces 20 years in prison and will be sentenced in May.