Dr. Mark Chavez, a physician linked to the tragic overdose death of 'Friends' star Matthew Perry, has pleaded guilty to federal charges related to the distribution of ketamine. Chavez admitted to his role in providing the actor with the drug, which contributed to the fatal incident. He faces a potential sentence of up to 10 years in prison following his guilty plea in federal court. This case highlights ongoing concerns about the misuse of prescription drugs and the responsibilities of healthcare professionals.