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.

The UnitedHealth Group leader whose murder in December unleashed a torrent of public frustration and dissatisfaction with the U.S. health care system was pushing for some of the very improvements that critics have been seeking.

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.

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