A family spokesperson says his health was deteriorating, and he lost an excessive amount of weight while in detention.
Lim was charged with included harming the dignity of the supreme leadership, trying to use religion to destroy the North Korean system, disseminating negative propaganda about the North to overseas Koreans and helping American and South Korean authorities lure and abduct North Korean citizens, along with aiding their programs to assist defectors from the North.
Canadian officials flew Mr Lim to the capital Pyongyang to wait to dictator's decision. Warmbier arrived to the U.S.in a vegetative state and died six days after his release.
The 62-year-old was in poor health and wrote letters to his friends stating he had stomach pain and high blood pressure.
Mr Lim was convicted and sentenced in 2015 on charges of trying to use religion to destroy the North Korean system and helping USA and South Korean authorities lure and abduct North Korean citizens.
"We are relieved to hear that Reverend Lim is on his way home to finally reunite with his family and meet his grand daughter for the first time", family spokeswoman Lisa Pak said in a statement to CNN.
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His family urged Trudeau to personally take up his plight.
"We want to thank the global community for the continued prayers and support and we also ask that the world does not forget the people of North Korea".
"They were sending medication but there was a question as to whether he was actually receiving it in the way he should", he said.
'He had been under the penalty of indefinite hard labor as he conducted hostile deeds against the DPRK, ' the agency added.
Lim's Toronto-area church has said Lim visited North Korea more than 100 times since 1997 and helped set up an orphanage and nursing home.