Humbug Scrub is a locality north of Adelaide, South Australia in the local government areas of the Adelaide Hills Council and the City of Playford which contains the southern third of Para Wirra Conservation Park.

Thomas Eugenio Trevilyan, a victim and accomplice in the Snowtown murders,[3] was found hanging from a tree in Humbug Scrub on November 6, 1997.

Trevilyan, who suffered from paranoid schizophrenia, had been living with the murderers John Bunting and Robert Wagner for several months and had assisted in killing one of their victims.

In November 1997, Bunting and Wagner drove Trevilyan to Humbug Scrub, made him lean against a box, and put a noose around his neck.

Trevilyan was discovered dead the following day, and the coroner determined that he had committed suicide, citing his history of prior attempts.