LEE COUNTY, Fla. — Terry McDonald killed Mary Mount back in 2004.
Investigators say Mary disappeared after she met McDonald through an online gambling site.
McDonald was then found in Texas with Mary's car and credit cards.
He said Mary died from a medical emergency.
This year, local investigators went to Texas, where McDonald was serving a life sentence for another murder.
He confessed to suffocating Mary.
McDonald was sentenced to 25 years in prison.