Detective had three theories about Queensland mum's 1998 disappearance

Former detective Graeme Eaton testified at a coronial inquest that he investigated the 1998 disappearance of Joanne Butterfield under three theories. Eaton, who led the initial investigation in Mossman, Queensland, believed it was most likely that Ms Butterfield took her own life. Two male associates, Concetto "Con" Tati and Michael O Donoghue, are set to be questioned as witnesses in the inquest.

Tati, described as an "intimate partner" of Butterfield, was questioned about his background, but Eaton did not recall conducting a thorough check of Tati's criminal history or conducting further follow-up inquiries. Neither Tati nor O Donoghue were suspects in the investigation. Eaton also stated he did not recall investigating the frequent Cairns phone number that appeared on Butterfield's call charge records during the investigation.

Butterfield's belongings, including personal items, were found near a lookout along a cane railway in Pin Gin Hill about two days after her disappearance. An extensive search of surrounding areas took place the following month. Eaton agreed that the absence of blood or fluids on Butterfield's belongings likely influenced the decision not to conduct DNA tests.

However, he believed the lack of blood would not be expected in a case involving foul play. Shortly after reporting her mother missing, Butterfield's daughter, Skye Lemon, received some of her mother's personal effects in an envelope postmarked July 29, 1998, bearing Butterfield's handwriting. When asked if he considered the possibility someone else could have mailed the envelope, Eaton stated he did not recall thinking that way.