Video of the incident went viral over shows a woman identified as 71-year-old Judy Tucker, attack the two women inside of a Cheddar's Scratch Kitchen on Saturday (April 14). The seven-second video clip was aired Monday morning on NBC's "Today" show.
Riess is also accused of murdering her husband, David, in Minnesota before heading south to Florida.
Investigators found that Hutchinson's purse was in "disarray" with any cash, credit cards or identification missing.
After allegedly killing her hubby, Riess forged her husband's signature to swipe $11,000 from his bank account and headed to a casino in Iowa.
Lee County Undersheriff Carmine Marceno says that although Riess "may look like anyone's mother or grandmother, she's an absolute cold-blooded murderer".
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Authorities believe Riess fled Minnesota, traveling to Florida where she's suspected of fatally shooting 59-year-old Pamela Hutchinson.
As Riess criss-crosses the country in Hutchinson's Acura, investigators warn she is "armed and unsafe". Authorities say she stole Hutchinson's vehicle, which has been seen in Louisiana and Texas. Authorities say this was confirmed after Hutchinson was found dead.
On the "Today" broadcast, Marceno said that Riess will run out of money and could possibly kill again. Her current location is unknown.
A witness named LaKeycia Ward posted the video on YouTube wrote in the description that Tucker and her family were angry because the service women had not waited for them to reverse back into a handicap spot for Tucker's husband, going around them and parking somewhere else, instead.
Lois Riess, a 56-year-old mother of three adult children and at least one grandchild, had a history of gambling problems, according to police.