It happened just before 3pm on the A386 near Bideford and involved a BMW, a Vauxhall Astra and a Citroen Dispatch.
A 41-year old woman from Torrington, who was passenger in the Astra, died at the scene.
A 29-year-old man from Bideford was detained on suspicion of causing death by dangerous driving - he was later released under investigation pending further enquiries.
Police are appealing for witnesses.
Political friction as Devon’s budget approved
Council tax will rise
Call for West Devon to be split to get best for residents
Residents in the north look to Exeter; and to Plymouth in the south
Dartmouth residents bemoan year-long closure of key road
Residents submit petition with around 2,500 signatures calling for action
Hard up charity will get more help from lottery cash
Citizens Advice helped more than 3,000 in North Devon over six months
Campaign for emergency phones at bridges to save lives
Temporary mobiles are in place at the moment
