Shannon Price
She was a social worker attempting to help the homeless population in Paragon City. However, the closer she got to them, the more she came in contact with "The Lost". To her credit, she was the first person to really point out that there was a problem greater than just homelessness going on with them.
Price and a member of the Dawn Patrol went into the sewers in an attempt to get even more information about the Lost. Price was not seen or heard from for some time after that. When she did emerge, she had gone mad. Bloodwork showed that she too had fallen to the Lost virus.
From the City of Heroes site
"There is no accurate way of counting how many of those who went underground were lost to the horrors below and how many just wanted to disappear of their own accord. Most of what's publicly known about this chthonic world comes from the reportage of a single, intrepid social worker named Shannon Price. Ms. Price was once a minor hero known as Starlight, and she had fought with distinction during the war. A long time advocate for the homeless, Price hung up her tights for good once peace had returned and focused all of her energies on trying to make Paragon City a safer, healthier place for its poorest citizens.
Through her volunteer work, Price became quite close with much of the homeless community and was soon tapped in to all their circulated rumors and stories. She heard repeated tales of people going down into the underground and disappearing for weeks or months. This, she knew, was not surprising. She'd fought in those tunnels and knew how dangerous they still were. What was interesting was that these lost folk would then turn up again sometime later, often different than they'd been before. They were brusque and almost business-like, always moving with a purpose and never stopping to chat with old friends. They stuck together in tight cliques, and were rumored to have moved beyond simple foraging to armed robbery and other crimes.
Price decided to investigate further, and calling in a few favors from her Dawn Patrol friends, she managed to wrangle an interview with one of these "mole people" (as other homeless called the underground dwellers) who had been captured during a bank robbery. Although at first silent and defiant, the prisoner became more and more anxious and unsure with each hour he spent separated from his cohorts. He began to babble incoherently of magic mists and green gods. He claimed that he was part of a new underworld order, a troupe of the touched, that he referred to as The Lost. Price could not make much sense of any of this, but when routine blood tests showed that some sort of mutagenic chemical was present in the man's blood, it became obvious that there was more to this problem than met the eye.
Together with a her old friend Quint "The Fist" Velasquez from the Dawn Patrol, Price once again donned her costume and set off into the sewers, looking for some answers. It was three months before she was seen again, this time without Quint at her side. The Dawn Patrol sent several more teams into the sewers to search for the missing heroes, but they found no trace of them or their fate. When Shannon Price appeared once more, it was crawling up through a manhole in the middle of rush hour traffic. She was rushed to the hospital, since she had obviously suffered a great deal of punishment and pain during her absence.
The intrepid social worker never achieved a mental state that one could call sane or even lucid. Lab tests showed that she had the same mysterious mutagen in her blood that investigators had found in captured members of The Lost. When questioned, she readily spouted forth a largely unintelligible tale. Dawn Patrol investigators were able to eke out a few solid facts from the garbled narrative. According to Price, The Lost seems to be a loosely organized confederation of the mentally ill, street people, and anyone else who has become desperate enough to find their way underground."