Mangione marked his 27th birthday with a list of "27 Things I'm Grateful For" that he sent to various people who have been writing to him in jail and that is now circulating online.

Luigi Mangione lists 27 things he's grateful for behind bars ahead of trial for killing UnitedHealthcare's CEO, as court ...

Shares of UnitedHealth Group Inc. took a deep dive Tuesday, after the health insurer said it no longer backed its full-year financial outlook, as medical costs continued to rise more than expected.