"It feels pretty good, I'm really excited," Walsh said of his decision. "I think Northwestern is a great school and will be a great fit for me."
The decision came on Tuesday because Walsh feared his window to join Northwestern may be closing.
"I just thought it was a good school and didn't know how long this opportunity would be there," said Walsh. "I wasn't sure if I still have had a spot. I wanted to take advantage of the opportunity. I don't think it gets much better than Northwestern. I decided to commit."
Walsh phoned Fitzgerald and the two discussed his decision, then the former All-American linebacker discussed why he chose Northwestern.
"It was cool hearing about why he went to Northwestern," said Walsh. "I'm glad I'm going there, I'm very excited."
Walsh is Northwestern's 15th verbal commitment and second of the day, joining three-star outside linebacker Anthony Walker.
Similar to Walker, it was Northwestern's combination of academic prestige and Big Ten football which would become the top selling point for Walsh.
"There aren't too many schools with the academics like that," Walsh said. "It's Big Ten football. You can't get a package like that."
Walsh is thrilled to have his decision in the books and is already looking forward to joining the Wildcats on campus.
"It feels great," he said. "I'm going to be set with Northwestern. I think I'm going to have a great time there. I wanted to continue playing football and get a great education. I'm really excited, can't wait."