There is no credible or verifiable evidence in the provided search results to confirm that Noem made the statement about US Marshals detaining a cannibal who started to eat himself on a plane.
Noem said: I was talking to some US Marshals who were partnering with ICE, they said they had detained a cannibal, put him on a plane to take him home, and he started to eat himself

FactVerify
Source: factverify.com
What the Evidence Shows
The claim states that Noem said she spoke to US Marshals partnering with ICE who detained a cannibal, put him on a plane to take him home, and he started to eat himself. The search results primarily contain general information about ICE, criminal proceedings related to other events, and unrelated news about attacks on ICE agents. None of the sources mention Noem making this statement or any incident involving a cannibal detained by US Marshals and ICE.
The sources do not provide any corroboration or context for this claim. Given the lack of any direct or indirect evidence in reputable or relevant sources, the claim cannot be verified based on the information available. Without additional credible sources or direct quotes from Noem or official records, this claim remains unverifiable.