A masked man fatally shot Thompson in Midtown Manhattan on December 4 before escaping out of the city, leading to a six-day manhunt for the gunman, which ended Thursday with the arrest of 26-year-old Luigi Mangione. He has been charged with murder.

The GiveSendGo defense fund for the 26-year-old Mangione was established by an anonymous group calling itself "The December 4th Legal Committee," apparently in reference to the day Mangione allegedly ambushed and gunned down Thompson in Midtown Manhattan as the executive walked to his company's shareholders conference at the New York Hilton hotel.

GoFundMe has canceled all pro-Luigi Mangione campaigns after suspected killer's arrest for Brian Thompson's murder.

According to GoFundMe’s site, you’re allowed to crowdfund for people who can’t afford their medical bills, but not for someone accused of a violent crime. It didn’t take long after law enforcement officials named a person of interest in the murder of UnitedHealthcare CEO Brian Thompson for the campaigns to begin.

Luigi Mangione's lawyer said he wants to see the new fingerprint and ballistics evidence announced by the New York Police Department.

The man charged with killing UnitedHealthcare CEO Brian Thompson on a Manhattan street was seen near a Port Authority bus station 46 minutes after the shocking crime, New York police said, before he made his way to Pennsylvania,

Investigators say they now have evidence linking Luigi Mangione to the scene of the murder of the UnitedHealthcare CEO Brian Thompson, and they are working on getting him back to New York. CBS News New York's Dick Brennan has more on the legal back-and-forth ahead.