The Minnesota Bureau of Criminal Apprehension said she likely used the same gun in both killings.
U.S. marshals caught the woman dubbed "Losing Streak Lois" in Texas near the U.S. -Mexico border on Thursday after a multi-state crime spree, authorities said Thursday. She was identified and arrested without incident.
The Dodge County Sheriff's Office announced on its Facebook page that it will hold a press release on Friday.
Several bank transactions and Riess' interest for gambling had given investigators some clues to find her.
"I want to acknowledge the doggedness of our deputies, specifically in Florida, Minnesota and Texas, and our state and local law enforcement partners who worked this case around the clock", said Berger.
Authorities have not determined whether Riess will be sent to Minnesota or Florida first.
'Ms Hutchinson's purse was found to be in disarray and all cash, credit cards and identification appeared to be removed, ' Lee County Undersheriff Carmine Marceno said. "Tonight, she sits in a jail cell in Texas".
Riess was apparently sitting at a restaurant by herself when the deputies arrested her. She also traveled to Northwood, Iowa, where she spent most of the day gambling at Diamond Jo Casino, the Dodge County Sheriff's Office said.
Riess had been on the run since late March.
Riess and Hutchinson were similar in age and appearance, making it easier for Riess to use her I.D.
She's wanted for the murder of her husband and Fort Myers Beach woman Pamela Hutchinson.
On March 23, police found Riess' husband dead of an apparent gunshot wound at their Blooming Prairie, Minn., home, Fox 9 reported.
That's where she met and soon befriended 59-year-old Pamela Hutchinson, authorities said. Authorities say she may have targeted Hutchinson because the two women looked alike, possibly a fatal coincidence for Hutchinson. It is a white 2005 Acura TL with Florida license plate Y37TAA. He thanked not only the U.S. Marshal's office but Lee County authorities and Sheriff Rose of Dodge County.
Riess faces warrants in Lee County on second degree murder, grand theft, identity theft, and grand theft auto. Shortly after Hutchinson's death security video was also obtained from a hotel in Ocala where Reiss is seen entering and speaking with the front desk clerk. Riess was wanted in connection with murders in Minnesota and Florida. Authorities went to the casino but Riess had already left.
It was that vehicle spotted on April 8 near Corpus Christi, Texas.
This story is breaking, and more details are to be released.