An overdose occurs when a person ingests some form of drug or stimulant in a quantity that the body cannot handle. Usually overdoses prove to be fatal and lead to death. Besides that, overdoses can also easily cause a person to lose his/her mental faculties. The deadliest drug in the world, heroin, is known to be the number one killer among all drugs. Celebrity overdoses are well known to the world and some great voices have also fallen victim to drug overdose. Here, we look at some of the well known singers who died of drug overdose.