The person believed to have shot dead three people on a property in rural Queensland is custody as details of a potential motive for the killings slowly come to light.<br /><br />The alleged gunman is one of three people currently being held by police, while a fourth victim continues to recover in hospital after being shot in the stomach.<br /><br />The victims are all from the same family and have been named in multiple media reports as Mervyn and Maree Schwarz, and Maree's son Graham Tighe.
