I remember reading in an early Michael Connelly novel from the late nineties a remark about how one of the characters pronounced Los Angeles with a /g/ sound, making it /lɒs'æŋgələs/.
So far as I remember, the character was a woman in her sixties, so she would have been born in the thirties. Such a pronunciation is given as less common than /lɒs'ændʒələs/ by J.C Wells in the Longman Pronunciation Dictionary. Now apart from this fictitious character, I've never heard anyone say Los Angeles like that.
Is this way of pronouncing it still extant? If yes, do age or other considerations account for it?