Smart answer:

Your search for In which city was John F Kennedy assassinated returned the following results:

in Dallas

When John F. Kennedy was assassinated in Dallas, Helms was given the responsibility of investigating Lee Harvey Oswald and the CIA.

Source:

Dallas Texas

On November 22, 1963, President John F. Kennedy was assassinated in Dallas Texas.

Source:

in Downtown Dallas

Just three weeks later John F. Kennedy was assassinated in Downtown Dallas.