UnitedHealth Group is facing a staggering loss in its market value following the former CEO’s sudden murder. The shocking assassination of Brian Thompson last December took the world by storm as all eyes focused on Luigi Mangione — the man who was allegedly responsible for gunning him down.

UnitedHealth Group CEO Andrew Witty honored Brian Thompson, the health insurance executive murdered last month, praising his dedication to improving the U.S. health care system. Witty acknowledged public support following the tragedy and highlighted the nation’s costly health care as the root issue behind access and quality concerns.

In its first results since its insurance unit CEO was fatally shot in New York City, UnitedHealth Group reported Thursday weaker-than-expected fourth-quarter revenue, prompting its shares to fall in early morning trading despite quarterly profit beating projections.

In his first public comments since one of his executives was shot to death, UnitedHealth Group CEO Andrew Witty said the healthcare system “needs to function better.”

UnitedHealth reported fourth-quarter results on Thursday that reflected persistent challenges for the health insurance sector.