Joseph Daniel O'Toole was born in Liberty City, he is a member of the Sindacco Family and the manager of Paulie's Revue Bar, named after Sindacco Family Don Paulie Sindacco. He has an uncle who he claims was a paedophile. He was arrested, at an unknown time, for statutory rape, even though the girl he slept with was said to be eighteen, and was raped in prison because of that. He was also suspected by the FBI to be downloading child pornography, but was never arrested for it, though his hard drive has been searched on at least one occasion. O'Toole, having an Irish ancestry, is upset with Paulie Sindacco as he has yet to be "made" due to not being an Italian. O'Toole then begins to work for the Leone Family and employs Toni Cipriani, after Cipriani kills some of the Sindacco mobsters at a construction site in Hepburn Heights, which O'Toole filmed to release later as a snuff film. Cipriani first helps O'Toole by driving his van around the Red Light District to allow O'Toole to get his cut from his prostitutes and then informs him that the LCPD are going to raid his club, allowing Cipriani to rescue Don Salvatore Leone. O'Toole continues to feed Cipriani information, allowing Cipriani to protect a Leone casino in St. Marks and then to destroy the Sindacco run 'Dolls' House casino.
Cipriani begins to work for Salvatore Leone and his wife, Maria Latore, but again works for O'Toole, firstly rescuing Salvatore after he was kidnapped from Paulie's Revue Bar and later protecting Salvatore when he personally goes to kill the Sindacco mobsters at the club. O'Toole later has Cipriani follow Massimo Torini, a high-ranking member of the Sicilian Mafia, who Salvatore correctly suspects is planning something in the city. Salvatore later decides to 'make' O'Toole and has Cipriani and Mickey Hamfists accompany him to the Harwood Autocrusher and Junkyard, where O'Toole is killed by a shot to the back of the head, fired by Hamfists, who explains that O'Toole could not be trusted after turning against the Sindacco Family. Cipriani later disposes of his body, dumping the body and car into the sea.
Sometime after the events of his death, his club is renovated by Luigi Goterelli and becomes Luigi's Sex Club 7. This decision also marks the beginning of the end to Sindacco interests on Portland and later Liberty City.
- GTA Liberty City Stories
- Snuff (Voice)
- Bone Voyeur! (Boss)
- Don in 60 Seconds (Boss)
- A Volatile Situation (Boss)
- Blow up 'Dolls' (Boss)
- Contra-Banned (post-mission phone call)
- Salvatore's Salvation (Boss)
- The Guns of Leone (Boss)
- Calm Before the Storm (Boss)
- The Made Man (Boss/Killed)
- O'Toole's execution bears similarities to the execution of Tommy DeSimone (he is lured into thinking he is going to be made, and then killed) and both the novel and film The Godfather (Paulie Gatto is killed the same way as O'Toole).
- O'Toole appears to take influence from Henry Hill in the film Goodfellas, as both have Irish ancestry and as a result cannot be "made".
- His favorite radio station is Flashback FM.
- O'Toole has a tombstone at the Liberty City Cemetery despite his body being dumped at sea. It is possible that the car with his body have been pulled out of the water.
- In a beta screenshot of GTA Liberty City Stories, O'Toole is shown to wear purple glasses.
- A figure wearing a cowboy hat can be seen in the back of O'Toole's concept artwork, in the door of his strip club.