Jeff is a person in GTA IV who is paranoid about his ex-wife sleeping with other men. He asks you to take pictures of his wife and her boyfriend together. Once you have waited a while he will call you and ask you to come and help him with a job. He has killed his wife and asks you to dump her body in the Humboldt River. After that he tells you he needs help with a job again. Niko tells him to stay calm and have a drink or two but then he gets mad at Niko and runs out into the road to get hit by a Comet.