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Jemma Lilley and Trudi Lenon are among the rarest type of killer — female thrill killers motivated by sinister yet rational behaviour. Clinical forensic psychologist Lisa Warren, who works with murderers, said the ratio of these types of male killers outnumber women more than nine to one. As the dominant force in the murder of year-old Aaron Pajich-Sweetman, Lilley is even more of a rarity. Dr Warren said most female killers were swept along as co-offenders by a complex relationship with their murderous partner. Yet Lilley, who did not claim mental illness in her defence, appeared to have a thirst for the kill, having previously told a co-worker that murder was a bucket list experience she wanted to have by the age of Although Dr Warren would not comment specifically on the recent case, the female co-offender profile appears to fit Lenon.