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The bodies in the barrels - Self-styled vigilantes John Bunting and Robert Wagner convinced themselves they were hunting pedophiles in Snowtown, SA.

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John Bunting and Robert Wagner - They used various implements of torture including an electric shock machine, pliers, sparklers, syringes, hammers, hand and thumb-cuffs, cigarettes, and garrottes on their victims.

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Snowtown, SA - The pair hid 12 bodies in barrels before they were discovered by police.

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‘Aunty Thally’ - Caroline Grills appeared to be a kind sweet lady, but she was poisoning friends and relatives she didn't like, feeding them cakes and biscuits laced with a deadly poison.

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Thallium - Her poison of choice was thallium, which is used to exterminate rats.

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Murder most foul - She was convicted of four murders and one attempted murder. She died in prison in 1960.

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Ivan Malat - The infamous Ivan Malat specifically targeted backpackers.

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Backpacker murder - The victims were young travellers from England, Germany, and Melbourne who Milat picked up hitchhiking.

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Torture - It is believed that Milat took his time with each victim, torturing them and then burying them in shallow graves.

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William MacDonald - William MacDonald has the dubious honor of being called Australia's first serial killer. He was active in the 1960s.

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Multilation - He lured his victims into parks and sliced off their genitals. During his trial, some jurors fainted while hearing the details.

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Roger Dean - Roger Dean was a nurse who was convicted of murdering 11 nursing home residents in a fire at Quakers Hill in 2011.

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Daryl Suckling - In 1987, Daryl Suckling was convicted of the rape and murder of Jodie Larcombe, whose body was never found.

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John Cribb - While on parole in 1978, Cribb abducted and murdered Valda Connell and two of her six children in their home.

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Bradley Murdoch - Peter Falconio was picked up and ruthlessly murdered by Bradley Murdoch while backpacking.

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Stopped a nation - The whole nation was swept up in the case, and Falconio's body has never been found.

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The "granny killer" - John Wayne Glover was notorious for bumping off elderly women in Sydney’s leafy North Shore.

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Six victims - He murdered six elderly women. He would gain access to homes by offering to carry their shopping home.

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Walter Marsh - March ambushed nurse Michelle Beets outside her Chatswood home in 2012. The former Marine stabbed her to death.

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The Rockhampton rapist - Nobody really knows how many women Leonard Fraser murdered. He strangled women with their own underwear.

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Ponytails - Police found the hair of three women in his possession. None of them has ever been identified.

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Sef Gonzales - The sleepy suburb of North Ryde was shocked when Gonzalales was found guilty of murdering his parents, Teddy and Mary, and sister, Clodine, at their home here in July 2001.

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Michael Murdoch and John Travers - Anita Cobby was abducted by Murdoch and Travers while she was walking home from Blacktown station. She was raped, tortured, and murdered in 1986

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Outrage - A riot squad had to be called in to protect the killers as they made their first court appearance at Blacktown.

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Andrew Garforth - Andrew Garforth can never be released from jail for the rape and murder of Ebony Simpson, 9, in Bargo as she walked from home from her school bus in 1992.

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Katherine Knight - Knight was the first woman sentenced to life behind bars after she stabbed her partner 37 times before skinning him and cooking his body parts.

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The baby farmers - Back in 1892, and John and Sarah became "baby farmers". They took care of unwanted children for a fee.

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Gruesome - Instead of caring for them, they ruthlessly disposed of 13 children.

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Sleep - Don't let all the scary stories scare you. Remember, be safe!

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