The parents of US student Otto Warmbier have claimed Kim Jong Un and his "evil regime" are responsible for their son's death.
It's a sharp rebuke of Donald Trump's comments about the case yesterday.
The Warmbier family has responded in the wake of the latest summit between the US and North Korean leaders.
Otto Warmbier was medically evacuated from North Korea in 2017 after it emerged he had been in a coma since he was jailed in March 2016.
The student had been sentenced to 15 years in prison with hard labour after he admitted trying to steal a propaganda sign from the staff-only area of a hotel he was staying at.
In 2017, President Trump claimed the student was "tortured beyond belief by North Korea".
"Bad things happened"
This week marked his second meeting between Trump and Kim Jong Un.
The Vietnam summit ended early without a deal on sanctions and denuclearisation.
During a press conference following yesterday's summit, President Trump confirmed he had discussed the Warmbier case with Kim Jong Un.
The US president said he took the North Korean leader at his word that he didn't know about the treatment of Otto Warmbier.
He suggested: "I did speak about it, and I don’t believe that he would’ve allowed that to happen. Just wasn’t to his advantage to allow that to happen.
"Those prisons are rough. They’re rough places. And bad things happened. But I really don’t believe that he was — I don’t believe he knew about it."
He added: "I don’t think that the top leadership knew about it."
However, the Warmbier family today said it had to speak out following the summit - firmly disputing Trump's suggestion that Kim wasn't involved.
In a statement, Fred and Cindy Warmbier said: "We have been respectful during this summit process. Now we must speak out.
"Kim and his evil regime are responsible for the death of our son Otto. Kim and his evil regime are responsible for unimaginable cruelty and inhumanity.
"No excuses or lavish praise can change that."
Main image: American student Otto Warmbier in Pyongyang, North Korea. Picture by: Jon Chol Jin/AP/Press Association Images