All sources seem agreed that she was born Maria Lucia Tolo on January 16th 1944, in Rome.
It appears that she first came to public attention while still at school, as a presenter on the TV game show Il Musichiere in the late 1950's. She launched her acting career at age 16, with 4 film appearances in 1960. Within a few years she was playing lead roles in peplums and eurospies. She embraced exploitation fare for awhile in the early 70's, but, unlike many other actresses of her generation, she was able to balance this with more serious roles on television and worked steadily until 1985, when she apparently retired.
Surprisingly little is known of her private life - designer Valentino has been quoted as saying Marilù was the love of his life, but the nature and length of their relationship is unknown and she was also romantically involved with director Dario Argento at some point. Many sources report that she also worked as a fashion model. It appears she spent a few years in the late 70's trying to break into the American market, when she appeared in an episode of Charlie's Angels, screen-tested for Superman and appeared as a guest on various U.S. talk shows. In 1983, aged 39, she posed nude for Italian Playboy magazine.
Marilù is presumed to be still living at the time of writing - while there has been no news of her since 1985, I assume that she was famous enough that her death would not have gone unreported.
What little details of her life are known are repeated by many internet sources and have been confirmed as much as is possible.
- Dolci inganni .... Margherita (credited)
- I piaceri del sabato notte .... The Seamstress (credited)
- La regina delle Amazzoni .... Amazon (credited)
- Urlatori alla sbarra .... Marilù (credited)
1963 - Adultero lui, adultera lei .... Lina (poster credit - role unconfirmed)
- Shéhérazade .... Shirin (credited)
1964 - Il magnifico gladiatore .... Velida (credited)
- Il trionfo di Ercole .... Princess Ate (credited)
- L'ultimo gladiatore .... Ena (credited)
- Maciste, gladiatore di Sparta .... Olympia (credited)
- Matrimonio all'italiana .... Diana (credited)
1965 - Giulietta degli spiriti .... TV presenter (uncredited)
- La Celestina P... R... .... Silvana (credited)
- Le chant du monde .... Gina (credited)
- Le notti della violenza .... Carla Pratesi's sister (credited)
- Misión Lisboa .... Terry Brown (credited)
- Una ráfaga de plomo .... Yasmin (poster credit - role unconfirmed)
1966 - Avec la peau des autres .... Anna (credited)
- La bourse et la vie .... Violette (credited)
- Le judoka, agent secret .... Vanessa (poster credit - role unconfirmed)
- Perry Grant, agente di ferro .... Paola Kuriel (credited)
- Poppies Are Also Flowers (TV movie) .... Sophia Banzo (credited)
- Se tutte le donne del mondo... .... Gioia (credited)
- Un colpo da mille miliardi .... Prinzi (credited)
- Zarabanda Bing Bing .... Sofia (credited)
1967 - Casse-tête chinois pour le judoka .... Jennifer (credited)
- Le plus vieux métier du monde .... Marlene, Miss Physical Love (credited)
- Le streghe .... Maid (credited)
- Se sei vivo spara .... Flory (credited)
- Sept hommes et une garce .... Countess Carlotta (credited)
1968 - Candy .... Conchita (credited)
- Commandos .... Adriana (credited)
- Un killer per sua maestà .... Sylva (credited)
1969 - I dannati della Terra .... Adriana (poster credit - role unconfirmed)
- Las trompetas del apocalipsis .... Helen Becker (credited)
1970 - Gradiva .... Karin (credited)
- Roy Colt & Winchester Jack .... Manila (credited)
- Uccidete il vitello grasso e arrostitelo .... Verde (credited)
- Un été sauvage .... role unknown (poster credit)
1971 - Confessione di un commissario di polizia al procuratore della repubblica .... Serena Li Puma (credited)
- Eneide (TV mini-series) Eps. 1, 3, 5, 7 .... Venus (credited in all episodes)
- Il romanzo di un ladro di cavalli .... Manka (credited)
- La controfigura .... Marie (credited)
- Siamo tutti in libertà provvisoria .... Emilia (credited)
- Viva la muerte... tua .... Lupita (credited)
1972 - Abuso di potere .... Simona (credited)
- Bluebeard .... Brigitt (credited)
- Jus primae noctis .... Venerata (credited)
- Meo Patacca .... Sora Nuccia (credited)
- Mio caro assassino .... Dr. Anna Borgese (credited)
1973 - La porta sul buio (TV series) Ep. 4: "Testimone oculare" .... Roberta Leoni (credited)
- Le cinque giornate .... The Countess (credited)
- Themroc .... The Secretary (credited)
1974 - Il trafficone .... Rosalia (credited)
- Orlando Furioso (TV mini-series) Ep. 1 .... Alcina (credited)
- Prigione di donne .... Susan (credited)
1975 - Au-delà de la peur .... Nicole (credited)
- La bufera (TV mini-series) All episodes .... Liana Ughes (credited)
- Les brigades du Tigre (TV series) S. 2, Ep. 6: "De la poudre et des balles" .... Léa (credited)
- Les malfaisants (TV movie) .... Lia (credited)
1976 - Cours après moi... que je t'attrape .... Anita (credited)
- Dimenticare Lisa (TV mini-series) All episodes .... Lisa Carter (credited)
1978 - The Greek Tycoon .... Sophia Matalas (credited)
1979 - Charlie's Angels (TV series) S. 4, Ep. 5: "Fallen Angel" .... Carla Leone (credited)
1980 - The Sleep of Death .... Countess Elga (credited)
1982 - Assassinio al cimitero etrusco .... Contessa Maria Volumna (credited)
- Marco Polo (TV mini-series) Ep. 1 .... Donna Fiammetta (credited)
1983 - Il tassinaro .... Fernanda Rossetti (credited)
- Vacanze di Natale .... Grazia Tassoni (credited)
1984 - The Last Days of Pompeii (TV mini-series) All episodes .... Xenia (credited)
1985 - Sogni e bisogni (TV mini-series) Ep. 11 .... Wanda De Amicis (credited)
- Numero un (1975 TV sketch show) Ep.: "Sacha Diestel", as Herself (credit unknown)
- Profondo rosso (1975) as Ex-girlfriend, seen in photograph (uncredited)
- Superman (1978) Screen test, released as a DVD extra in 2002 (credited as "Marilu Tulo")
- Il Musichiere (Late 1950's TV game show) Unknown episodes. Wikipedia, as herself, as assistant to Mario Riva
- Retour à Bacoli (1966 TV movie) IMDb as Clélia
- Le féminin pluriel (1982 TV movie) IMDb as Franca
- Le ambiziose (1961) IMDb with no role. Marilù is not credited and, as far as I could find, does not appear,