Mister Lopez, born in 2212, is a quiet, lonely and severely depressed 65-year-old man who has been living in the common room of Rivet City for the past 10 years. His wife and child were killed by Raiders, and he came to Rivet City alone and lost. He regularly visits Saint Monica's Church, and spends much of his time reading or praying there. Lopez also attends the weekly church service and receives frequent counselling from Father Clifford, the church priest. He consumes his meals in the common room and often sleeps for long periods out of sheer depression. Once a day, he climbs to the top of the bridge tower and contemplates whether to end his life by jumping.
Lopez considers committing suicide due to the fact that no one remembers him or even cares about him (also learned by talking to him on the Flight Deck that he couldn't save his family), but he doesn't have the courage to do it himself. You can find him on the observation deck at the top of bridge tower every day from 8:00am – 12:00pm and 3:00pm – 5:00pm. You can:
Help him to commit suicide by pushing him off the deck (negative Karma).
Talk him into committing suicide by saying he's pathetic (negative Karma).
Use speech to convince him that Ted Strayer needs someone to give him guidance and that Lopez is the one to provide it (positive Karma). If Ted Strayer has already been killed, it is impossible to save Mister Lopez. After (or if) you manage to convince him to look after Ted Strayer, you will not be able to open dialog with him. Instead, he will simply say, "I'm just taking things one day at a time." You will have to wait until his 3:00pm – 5:00pm slot, as he often will get into a "Just leave me alone" mood during his suicidal contemplations in the morning.