Leon Nepper was pronounced dead at 1:25 pm on Sunday and the Yukon Coroner's Service, along with the assistance of the RCMP, are continuing their investigation.
Chief Coroner Heather Jones has notified the public that Leon Nepper, an accused mail bomber and Whitehorse resident who was facing charges of attempted murder, has died in Whitehorse hospital.
Nepper was taken into custody following on September 13th following his suspected role in the mailing of an explosive device which went off at his brothers residence in Port Alice, BC.
Roger Nepper, Leon Nepper's brother, lost several fingers in the incident when he opened the exploding package at his home.
Leon Nepper was found to be in distress after being put into custody at the Whitehorse Correctional Centre and consequently was transported to Whitehorse General Hospital where he was later pronounced dead at 1:25 pm on Sunday.
The Yukon Coroner's Service and Whitehorse RCMP were called to attend the death at the hospital as well.
Nepper was 73 at the time of his death and an autopsy is being conducted at Vancouver General Hospital later this week.
The Yukon Coroner's Service, with the assistance of RCMP, are continuing their investigation.

2025 Territorial Election Interview Series: Yukon NDP candidate for Kluane John VanderMeer
2025 Territorial Election Interview Series: Yukon Party candidate for Klondike Richard Nagano
2025 Territorial Election Interview Series: Yukon Party double feature! YP candidate for Vuntut Gwitchin Sandra Charlie and YP Candidate for Southern Lakes Tyler Porter
Attempted abduction reported in Whitehorse
2025 Territorial Election Interview Series: Yukon NDP candidate for Vuntut Gwitchin Annie Blake
2025 Territorial Election Interview Series: Yukon Liberal Party candidate for Southern Lakes Cynthia James
2025 Territorial Election Interview Series: Yukon Liberal Party candidate for Mayo-Tatchun Jeremy Harper
2025 Territorial Election Interview Series: Yukon NDP candidate for Mountainview Linda Moen
The 2025 Territorial General Election at a glance
2025 Territorial Election Interview Series: Yukon Party candidate for Riverdale North Rose Sellars and Yukon Party campaign chair Geraldine Van Bibber
2025 Territorial Election Interview Series: Yukon NDP candidate for Watson Lake-Faro-Ross River Josie O'Brien
2025 Territorial Election Interview Series: Yukon NDP candidate for Whistle Bend South Dustin McKenzie-Hubbard
2025 Territorial Election Interview Series: Yukon Party candidate for Mayo-Tatchun Cory Bellmore
Fatal fire at remote Yukon mine camp claims two lives
Yukoners unite to honour Missing and Murdered Indigenous Women and Girls
2025 Territorial Election Interview Series: Yukon Premier and Yukon Liberal Party Leader Mike Pemberton
2025 Territorial Election Interview Series: Yukon Party Leader Currie Dixon
2025 Territorial Election Interview Series: Yukon NDP Leader Kate White
CYFN commemorates National Day for Truth and Reconciliation