Might be the phones. Seems that Russell was deceased when his phone pinged at Mount Hotham (in Hotham Heights, which apparently is in the centre of Mount Hotham Ski Resort).
According to police documents submitted to the Melbourne Magistrates' Court, a security camera snapped four pictures of Mr Lynn's Nissan Patrol towing a trailer on Great Alpine Road at 9:48am on March 21, 2020.
A phone belonging to another man, Russell Hill, had connected to a nearby phone tower at Hotham Heights 10 seconds earlier.
While his phone was switched on, police allege Mr Hill was dead.
Detectives say data from Telstra showed Mr Hill's phone to be in the vicinity of the resort cameras 10 seconds after Mr Lynn's car travelled past them.
New details have been revealed in documents provided a committal hearing about why police allege Greg Lynn killed campers Carol Clay and Russell Hill in the Victorian High Country.
www.abc.net.au