The brother of a missing British backpacker will be among about 40 witnesses to give evidence at a pre-trial hearing later this month for an Australian drifter accused of murdering him, a prosecutor said in Darwin today.

The girlfriend of a missing British tourist said today that a man captured on a security camera at an outback service station had probably shot her boyfriend.

Australian Police took DNA swabs from the father and brother of a missing English tourist today in a bid to identify blood found at the outback site where he is believed to have been shot by a gunman.