In 2006, O'Connor founded the rap group La Coka Nostra where he was joined by George Carroll (Slaine), William Braunstein (Ill Bill), Dimant, and Schrody (only for the first album).

O'Connor knew Schrody when he went to William Howard Taft High School in Woodland Hills, California (1984–1986), and various hip hop event they attended in their teens.

[citation needed] While in House of Pain, O'Connor acted as the hype man, second emcee, art director and the graphic artist of the group.

[5] Rolling Stone gave three point five stars, good plus, and noted "with a groovy swagger, this collection of hard-core hip-hop tracks offers many moments of technicolor snap and crackle, and also titled House of Pain".

Q magazine wrote that it is a good album three stars and said "...their music is of the dense, hard-hitting school of hip hop...the group have absorbed black rap's musical lessons and create a satisfying platform for their above average deliveries..." The Source said it was a good plus, gave it three point five stars and concluded that it is "...a very solid and at times exceptional album...imagine if Licensed to Ill wasn't an upper middle class Jewish thing but rather a working class Irish thang...the atmosphere is like that of a cross between a frat party and a bar room brawl... NME gave it a six calling it good and noting "...contains some creative and accomplished rap music..."[citation needed] Rob Theakston of AllMusic gave it four stars.

[15] Matt Carlson of The Michigan Daily found the album quite good and noted "the music is laid back with some heavy driving forces underlying and strengthening it".

[20] Also in 1994, O'Connor acted in Allan Arkush's television film Shake, Rattle and Rock!,[21] part of the Rebel Highway series.

[citation needed] Dave Ferman of the Fort Worth Star-Telegram gave it one star and a half, calling it a "woeful mess".

[citation needed] After House of Pain disbanded, O'Connor said he struggled with drug abuse, a problem he developed when he became famous, and spent all the money he made from the group's success.

[citation needed] That year, he was the featured rapper in Powerman 5000's remake of the Frankie Goes to Hollywood hit song "Relax", on the Zoolander soundtrack.

[citation needed] In late 2004, the creation of the rap supergroup La Coka Nostra started when O'Connor was mentoring young artists.

[citation needed] O'Connor explains that he tool notice of two up and comers George Carroll (Slaine) and John Faster (Big Left) and brought them to meet his former DJ from House of Pain, Leor Diamant.

[29] They decided to make a group with an additional rapper, who didn't stay too long, that Diamant took under his wing, as well as O'Connor becoming its hype man and art director.

[33] Andrew Kameka of HipHopDX wrote that "the album is a mostly solid effort and exactly what someone would expect from a supergroup of like-minded members known for high-energy music".

[34] Adam Kennedy of the BBC while praising some the moments of the album said "it’s a tantalising parting taste of potential capabilities, yet until they improve a customer satisfaction hit rate that barely troubles one in three tunes here".

[37] Also in 2009, House of Pain reunited at a private event held by UFC president Dana White in Boston on St. Patrick's Day.

O'Connor took advantage of this free time to visit the town and found the location of the house used by the main characters in the filmThe Outsiders (1983).

[41] With team-members in Los Angeles, Chicago, and New York City, their visit documents notable pop culture landmarks from film, television, music, and true crime.

[43] Delta Bravo identified locations from movies and television shows including Fast Times at Ridgemont High (1982), Saturday Night Fever (1977), Valley Girl (1983), The Bad News Bears (1976), All in the Family (1971 to 1979), Gilligan's Island (1964 to 1967), etc.

[2] In 2012, separately from The Delta Bravo Urban Exploration Team, La Coka Nostra released their second album, Masters of the Dark Arts.

[citation needed] Adam Fleischer of XXL magazine noted that "La Coka Nostra remain decidedly true to their core with their new album" and "that they are indeed masters of the dark arts".

[46] Nathan G. O'Brien of Scene Point Blank gave it four out five star and said "with Master of the Dark Arts La Coka Nostra’s pluperfect union of bombastic boom-bap, record scratching, and realism-based hardcore rhyming".

[citation needed] Steve Juon of RapReviews gave eight point five out of ten and wrote "for a blissful 45 minutes it's an uncut dose of that nostalgia straight through the ear canals to the dopamine centers of my brain".

With the help of friends, the Oklahoma Film and Music Office, the City Council, local business and individuals who volunteered the restoration started.

a question about him and the museum was showcased ''Rapper Danny Boy O'Connor loved the Tulsa house used in the film version of this author's The Outsiders so he restored it''.

[61] In 2021, separately from The Delta Bravo Urban Exploration Team and The Outsiders House museum, O'Connor acted in the suspense film Ida Red.

[72] In February 2024, O'Connor served as judge alongside Olivia Jordan and Zac Hanson for the talent competition the "Big Show Off".

O'Connor explained that when he discovered that this additional slew of photos existed, he approached Moran, who he didn't know, and to his surprise she let him have the negatives so that he could develop them.

[75] On December 14, the 98th annual Tulsa Christmas Parade celebrated The Outsiders House Museum with its theme, "Stay Gold, Merry, and Bright," and O'Connor served as Grand Marshal.

(1994) Cochran's Drummer Boy Wild Horses (1998) Let Me Make You a Martyr (2016) - Willie Ida Red (2021) - Bird Out for Exile (2022) Little Dixie (2023) - Coka One Day as Lion (2023) - Prison Guard MacDougal Kid 90 (2021) Mad Props (2024) Just for Kicks (2005) Old House New Home (2022) 2022 - The Outsiders ‘Rare and Unseen’ - with David Burnett 2024 - The Outsiders on set - with Nancy Moran