Not really surprising here as they really didn't have a spot for him.
From The L.A.Times:
Norton, 41, said he spoke with new Bruins coach Rick Neuheisel and defensive coordinator DeWayne Walker about joining the UCLA staff as an assistant head coach. Chuck Bullough is UCLA's linebackers coach.
"I'm flattered. They'll always be a team in my heart," said Norton, an All-American linebacker for the Bruins in 1987 who played 13 seasons in the NFL. "I feel real good about Rick Neuheisel and what he's going to do there.
"The timing just wasn't right. I'm really appreciative of what Pete Carroll has done for me over here, and my business is not finished."
Nothing more to add really, that says it all.