It's important to differ Katerina Ivanovna Marmeladov from the other Katerina Ivanovna from "The Brothers Karamazov". These women are different characters from two different novels.
In this article we are talking about the heroine of "Crime and Punishment" - Katerina Ivanovna Marmeladov.
Who is Katerina Ivanovna in "Crime and Punishment"?
Katerina Ivanovna is the wife of a drunkard ex clerk, Mr. Marmeladov and is also the stepmother of famous Sonia Marmeladov (also - Sonya Marmeladova, Sonechka).