A friend did some researching at www.americanradiohistory.com and sent me this information:
The "Norwalk" COL came about as part of the settlement to the original November 1965 license challenge to KHJ-TV by Fidelity Broadcasting, which filed for channel 9 in that city so as to add a few brownie points for "first service". Without going through the entire history, the matter was resolved 33 years later (November 1988) when the Walt Disney Co. bought out both RKO and the competing applicant for a total of $324 million, then operated the station under the Fidelity name for a year before becoming Disney-Fidelity and changing the call letters to KCAL-TV a year later. Part of the deal was to have a hyphenated COL of "Norwalk-Los Angeles" for the first four years, after which they could drop both "Norwalk" and "Fidelity" ... which sure enough happened in late 1992.
A proposed sale to Pinelands that same year fell apart for a variety of reasons, and Disney subsequently decided to keep KCAL, not selling it until when they merged with ABC in 1995 and had to spin off channel 9 in order to keep KABC-TV/7 under the duopoly rules then in effect. The sale to Young was approved the following year; obviously, the Norwalk COL was long gone by then.
I remember when Youtube had the clip of Jerry Dunphy and Pat Harvey as the final anchors of KHJ9 say The station will be K*C*A*L -tv soon as the call letters. But that video was removed for some reason. Also that ID was interesting to see both KHJ and KCAL used at the same time due to the transition and make Los Angeles viewers aware that KHJ is no longer being used for 9 and KCAL is a fresh brand as some of the links said.