Latest CEO Murder: Search Warrants Issued Amid Investigation; Suspect Luigi Mangione is not a member of UnitedHealthcare, company says

NEW YORK– Luigi Mangione, the suspect accused of killing UnitedHealthcare CEO Brian Thompson was not a member of the insurer, a company spokesperson said.

“Brian Thompson’s killer was not a member of UnitedHealthcare,” the company told ABC News.

Prosecutors with the Manhattan District Attorney’s Office have begun presenting evidence to a grand jury as they work to secure an indictment against Mangione for Thompson’s murder, sources tell ABC News .

The prosecutor’s office declined to comment due to the secrecy surrounding the grand jury cases.

An indictment could strengthen the case for extradition, which Mangione is fighting.

The 26-year-old Ivy League graduate remains in custody at a Pennsylvania state prison after a judge denied him bail Tuesday. His next court date in Pennsylvania is December 30.

“He has constitutional rights and that’s what he’s doing” in challenging the interstate transfer, defense attorney Thomas Dickey told reporters Tuesday.

Authorities are still seeking access to a phone recovered by police in an alley following the shooting that is believed to be linked to the suspect, sources said Thursday. Police obtained a search warrant for the phone, sources said.

At least two other search warrants have been issued so far in the New York case. They include the search of the hostel where the suspect was staying in New York, as well as the backpack containing Monopoly money and a jacket that was found in Central Park and which appears to belong to him, said sources.

Mangione was apprehended Monday in Altoona, Pennsylvania, after nearly a week on the run following the Dec. 4 killing.

Three shell casings recovered outside the Midtown Manhattan hotel where Thompson was fatally shot matched the gun allegedly found on Mangione during his arrest, police said Wednesday.

Fingerprints recovered from a water bottle and at a Kind bar near the crime scene were also linked to Mangione, police said.

In Pennsylvania, Mangione faces charges including allegedly possessing an untraceable ghost gun.

In New York, he faces charges including second-degree murder.