Famous actresses and actors fall victim to drug abuse just as normal people do. Heath Ledger died from a combination of 6 prescription drugs, Judy Garland (known for her role as Dorothy in Wizard of Oz) died of a barbiturate overdose, and River Phoenix died due to his heroin addiction. Let these stories show you what drug use can do to you. Drew Barrymore fell into the use of drugs as a teen, but sought out help and went to rehab. She is now back on track with her career and very successful.