Bessels and the other surviving members of the expedition crew were questioned by a naval board of inquiry about the events leading to Hall's death. The official conclusion was that Hall had died of natural causes and had been treated by Bessels to the best of his ability. But in a forensic investigation of Hall's exhumed remains in 1969, lethal amounts of arsenic were found under his fingernails and toenails, fueling speculation and adding weight to Hall's accusations.
