The Zodiac killer was probably also the Black Dahlia killer.
Think about it & then research it. Same dude…
just a scrape from the wiki:
George Hodel, using Ogham (an ancient Celtic "tree alphabet") signed his real name, H O D E L, placing it both as the return address on the envelope and as a signatory inside the card which read, "You Ache to Know My Name…I'll Clue you in…" The code had remained undeciphered for 45 years. BASICALLY HE LAID THE LETTERS "HODEL" ON TOP OF EACH OTHER? RESEMBLES CELTIC CROSS?