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.”

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 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.

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.

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

UnitedHealth Group (UNH) , the largest health insurance provider in the U.S., ended 2024 on a devastating note. The company, which owns UnitedHealthcare and Optum, has been embroiled in massive controversy after UnitedHealthcare CEO Brian Thompson was shot and killed in front of a Hilton hotel in midtown Manhattan last month.