Film Noir Set in Los Angeles or San Francisco from 1940's or 1950's

[DrParker]

I am looking for the name of a movie set in Los Angeles or San Francisco from the 1940's or 1950's.  I don't remember the actors.  The premise is that a member of Scotland Yard comes to the U.S. to track a mad killer who escaped the U.K.  As it turns, out the member of Scotland Yard is actually the escaped killer.  I remember a person goes missing and they find the body in the closet or wall panel of an office.  Any help would be appreciated.  Thank you for the responses in advance.

[pennywise37]

how about either Counter Spy Meets Scotland Yard (1950) or David Harding Counter Spy (1950) the 2nd one i think is the first one but i had to look up the title on IMDB because i could not remember the name of it.

[M.10rda]

Do you recall any actors who appeared in this film?

[pennywise37]

https://www.imdb.com/title/tt0178372/?ref_=tt_mlt_t_1

https://www.imdb.com/title/tt0178348/?ref_=tt_mlt_i_1

i think the first one was David Harding