Police have identified the former Goatlord guitarist as the suspect who is believed to have shot neighbour Jennifer Bagley Donoso, 39, and her eldest son, eight-year-old Lex, before turning the gun on himself.

Authorities reveal cops had previously been called to the neighbourhood to investigate disputes between the 47 year old and Bagley, but no further details have been released, reports the Las Vegas Review-Journal.

Officials are still trying to determine a motive for the slayings, with homicide investigator Dan MCGrath saying, "(It's not so much) what happened, but why."

Las Vegas rockers Goatlord formed in 1985 and disbanded in 1997. Reports suggest the band was planning a reunion for a 2014 German music festival, but it failed to materialise.