Colin Moriarty

Colin Moriarty is Megaton's crime boss and the owner of Moriarty's Saloon. He has a computer which contains valuable information on the game's main quest. To access the information, you can either pay Moriarty for it, get the info from Nova, the local prostitute working for Moriarty, or convince Gob, the ghoul bartender, to tell you how to access his boss' computer. The player can also go into sneak mode, pickpocket Moriarty's key from him, use it to open a cabinet in the back that contains his computers password and gain the information that way. He possesses a irish slight accent in his speech. If you pay Jericho 20 caps for information, he will tell you that Moriarty keeps the payroll for Nova and Gob locked by his bed. Moriarty's bed is located upstairs in his saloon. Jericho informs you that Moriarty keeps the key around his neck.

Unfortunately, in the unpatched release version of Fallout 3, this key appears to be missing for some users playing the PC version of the game and cannot be pick-pocketed, However some other PC users have no such bug.

Appearances
Moriarty appears only in Fallout 3.

Behind the scenes
He is probably a reference to Professor James Moriarty, criminal boss and arch-nemesis of the famous fictional detective Sherlock Holmes.

Colin Moriarty is also a writer for the gaming news site, IGN.com and in one of his own Podcasts (Three Red Lights Ep. 44a) he says the character in Fallout 3 is named after him due to his status in the gaming community. He is a writer for the website of many gaming FAQ's. He has said that writing the FAQ for Fallout 3 will be very difficult for him. For more information on IGN's Colin Moriarty, see http://faqs.ign.com/articles/378/378384p1.html

Known Bugs and Solution
Moriarty has been reported to disappear into the wasteland making it difficult to complete the main quest. To determine if this has happened, select a quest involving Moriarty as the target (generally Following in His Footsteps), then bring up the World Map. If the marker for Moriarty appears north-east of Springvale School, then you can safely assume he has wandered away. This can be a dealbreaker for players who wish to do play with Good Karma, as the alternate solutions involve talking the information out of Gob or Nova and potentially hacking Moriarty's computer. There are plenty of easy ways to get good karma back though, don't stress about it. Just donate a scrap metal to Walter or some caps to the church!

While playing PC version you can also bring thim back by following Recovering missing NPC in Fallout 3 guide.