President Trump had called the young student's death "a terrible disgrace."
There is growing outrage over the death of Otto Warmbier.
Read: Student Otto Warmbier, Held in North Korea Until Last Week, Has Died, Family Says
The college senior died Monday, just seven days after he was sent home from North Korea in a coma.
Sens. John McCain and Marco Rubio have called the distressing case a murder.
The Republican lawmakers were not alone in their anger, as President Trump called the Warmbier family's ordeal a “terrible disgrace."
“That should never have been allowed to happen,” he said Monday.
But as the family finalized funeral arrangements Tuesday, the 22-year-old’s death remains shrouded in mystery.
Among the many questions is: Why did he die so soon in America after 17 months in a coma in North Korea with its limited medical resources?
Dr. Michael Baden, a Fox News contributor and one of the nation's leading forensic pathologists, says an autopsy may be the only way to determine if the student’s coma was the result of botulism and a sleeping pill, as North Korea claims, or a savage beating.
“By the time they let him come back, he was almost dead, his brain was severely damaged,” he told Inside Edition. “The autopsy will either show it happened from natural causes or by some kind of trauma or injury from pressure of the neck and chest which causes this specific kind of brain damage."
Warmbier’s heartbroken family lashed out at the North Korean regime Monday, saying in a statement: "the awful torturous mistreatment our son received at the hands of the North Koreans ensured that no other outcome was possible beyond the sad one we experienced today."
The popular honors student was a homecoming and prom king who played on his high school's soccer and swim teams.
Who could have predicted that this promising young man's life would take such a disastrous turn when he was arrested for taking a propaganda poster as a souvenir?
Read: Imprisoned American Student, 22, Sent Home From North Korea Amid Reports He's in a Coma
Now the tour company that arranged his trip, Young Pioneer Tours, says they will no longer take Americans to the hermit kingdom.
“A tragedy like this must never be repeated,” the company said in a statement. “We too are reeling with the shock of a young man's life taken well before his time.”
Watch: Roommate Believes Otto Warmbier Was Set Up by North Korea
