Carl Anthony Williams (13 October 1970 – 19 April 2010) was an Australian convicted murderer and drug trafficker from Melbourne, Victoria. He is the central figure in the Melbourne gangland killings as well as their final victim. He was sentenced to life imprisonment with a non-parole period of 35 years for ordering the murders of three people and conspiracy to murder a fourth (which was unsuccessful). On 19 April 2010, while incarcerated at HM Prison Barwon, Williams was beaten to death with the stem of an exercise bike by another inmate, Matthew Charles Johnson.