Rose said the county attorney's office is preparing second-degree murder charges against Riess in connection with her husband's death.
ABC-affiliate WZVN had reported earlier that Riess was a person of interest in the fatal shooting of Hutchinson, which took place in Fort Myers Beach. Authorities would also like to speak to her about the death of her husband, David Riess, who died of multiple gunshot wounds at his home on March 23.
Lois Riess of Blooming Prairie has been identified as a suspect in death of Pamela Hutchinson in Bradenton, Fla., according to the Lee County Sheriff's Office in southern Florida.
Authorities don't believe the women knew each other, but that Riess killed Hutchinson earlier this week to assume her identity. Local, state and federal investigators in Florida have watched hundreds of hours of surveillance video in an attempt to track Lois Riess, and believe she is now somewhere near Corpus Christi, Texas.
Riess is now wanted in two states and LCSO suggests she may now be traveling in a stolen white 2005 Acura TL, bearing the Florida tag Y37TAA.
A tip line has been set up for anyone with information about either murder or Riess' current whereabouts.More news: Duo pose as police; beat, rob woman
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More details are expected to be released later this afternoon.
One of David Riess' business partners asked Dodge County authorities to conduct a welfare check after he had not been seen for a couple of weeks.
"Investigators were unable to locate David's wife, Lois Riess", said the sheriff. She is known to frequent casinos. It was unclear how long he had been dead, Rose said.
Riess is considered armed and unsafe and should not be approached. Investigators added Lois Riess does not have check-writing authority for either account.
On March 24, the day after David Riess' body was found, investigators from the Dodge County Sheriff's Office and the Minnesota Bureau of Criminal Apprehension joined with agents from the Iowa Division of Criminal Investigation to see if Lois Riess was there, Rose said. Callers can remain anonymous.