Centene CEO calls virtual meeting after UnitedHealthcare CEO resigns, prompting insurers to remove executive photos.

• The virtual investor day of Centene, a big Medicaid insurer, was held instead of an in-person event at the New York Stock Exchange following the killing of UnitedHealthcare CEO Brian Thompson.
• The removal of photos of executives and board members from the websites of other major health companies, including UnitedHealthcare's parent company United Health Group, has been announced.
• On his way to UHG's investor day, Thompson was fatally shot outside the Hilton Hotel in midtown Manhattan by a masked gunman in what police described as a targeted slaying.

The death of CEO Brian Thompson prompted another major health insurer to switch from an in-person investor day in New York to a virtual event.

The removal of photos of executives and board members from the websites of major health companies, including UnitedHealthcare's parent company, has been prompted by Thompson's slaying.

Medica, a health insurer based in Minnesota like UnitedHealthcare, shut down its main campus in Minnetonka due to safety concerns for its employees.

Our top priority is the safety of Medica employees, and we have enhanced security measures for all of our staff, as stated by a Medica spokesperson to NBC News.

Our office buildings will be temporarily closed due to an abundance of caution, although we have not received any specific threats related to our campuses.

Centene, one of the largest Medicaid insurers, announced a change to a virtual event on Friday and was scheduled to have its investor day at the New York Stock Exchange next Thursday.

Centene announced that its Investor Day, originally scheduled to be held in person, will now take place virtually following the tragic loss of UnitedHealthcare's CEO Brian Thompson.

On Wednesday morning, an unidentified gunman fatally shot Thompson outside the Hilton Hotel in midtown Manhattan while he was about to enter the hotel for UnitedHealth Group's investor day. The event was abruptly cancelled after UHG leadership learned of the killing.

The police suspect that Thompson was intentionally targeted by the shooter, who left behind shell casings with the phrases "deny," "delay," and "depose," which may refer to terms used by insurance company critics to describe their approach to denying customer claims.

Sarah London, CEO of Centene, expressed the company's deep sadness over Brian Thompson's death and offered support to those affected. As a large health insurance company, Centene has a small community, and many members of the CenTeam had crossed paths with Brian during their careers.

"His family and colleagues are in our thoughts during this difficult time as he was a person with a deep sense of empathy and clear passion for improving access to care."

Centene's website had no photos of its executives on its website Friday.

UnitedHealth removed its webpage containing images and details about its top executives.

The webpage for the board of directors now lacks photos and details about its members.

also removed photos of its top executives from its website.

The Blue Cross Blue Shield Association removed a link to its executive biographies on its Healthcaredive.com website, according to a report by Healthcaredive.com.

Chris Pierson, CEO of BlackCloak, stated that executives of public companies who disclose events they will attend and post photos of their leadership and board members on company websites are vulnerable to harassment and threats.

In an interview, Ben Joelson, the principal and head of security risk at the Chertoff Group, stated that it is wise for insurers and other companies to remove images of their executives and board members.

"Joelson stated that the objective of what they are doing is to minimize the online risk surface and the amount of digital dust surrounding their executives. He believes that as more information about the specific motive becomes available, companies will adjust their protection profiles accordingly, given the clear targeting based on the executive's position."

He stated that his company is currently assisting several Fortune 500 clients in reevaluating their approach to investor and shareholder meetings, as well as ensuring they have a protective bubble around their key decision-makers.

Joelson stated that pre-announcing an event at a location and specifying the attendees increases the likelihood of the event occurring, and therefore, requires careful planning.

Since the two attempted assassinations of President-elect Donald Trump, the Chertoff Group has experienced an increase in queries from companies regarding their security.

"Joelson stated that clients and boards have been inquiring about whether their actions are in the best interest of their executives and whether they are acting in a prudent manner as an average company."

In an interview, Doug Mandell, a partner at Withersworldwide who negotiates contracts for executives with security provisions, stated that most executives consider personal security to be intrusive.

Thompson's killing may lead to more clients seeking additional protection from their boards, according to Mandell's prediction.

Mandell stated that the CEO was heading to a meeting with shareholders and that they had received threats before.

"Certainly, he should have had security. I believe many other CEOs will be telling their companies, 'I'm going into a situation where I need protection.'"

Mandell stated that in the past, it was more common for them to travel overseas. However, now they will be considering this matter locally.