Wisconsin was the other program in the mix, but Marsden was swayed to stay home after last weekend's meeting in Ames.
"I met with Coach Morgan and Coach Archibald [last] Friday," Marsden said. "I liked their presentation and they just sold me on it. I ended talking with my parents afterward and I chose to go to Iowa State."
Last season, Marsden averaged 12 points and 6 rebounds in a year that was stopped just short of a state title.
Lofton, the two-time Mr. Basketball in the state, led his team to a state title as a junior and a runner-up finish as a senior. He averaged 26 points a game last year and made 46% of his 3s. Lofton scored a lofty 2,736 career points.