Warren Davis: Johns Hopkins Hospital Shooter Photo?

A gunman shot and critically wounded a doctor at Johns Hopkins Hospital. He then contained to a room on the 8th floor of the Johns Hopkins Hospital building on the sprawling East Baltimore medical campus. But I heard everything's over now after the man who is named Warren Davis shot himself and his mother who was being treated in the hospital.
Can anyone explain in detail what really happened? Where can I see a photo of Warren Davis, I find the name familiar.

Warren Davis, shot his mother, Jean Davis, in her hospital room. The doctor, who was not identified, had been telling Davis about his mother's condition when the shooter became emotionally distraught and reacted, he was overwhelmed by the news of his mother's condition.
The doctor was rushed to surgery and is expected to survive. The shooting took place on the eighth floor of the main hospital.
A nurse who saw the gunman said he was upset about the medical treatment his mother was getting.

Anthony Guglielmi, chief of public affairs for the Baltimore Police Department, said that the doctor was taken to surgery but his injuries were not critical. He was shot in the abdomen.

No photos of Warren Davis have been revealed yet, here's a twit pic from a user named Justin.

No pictures of Warren Davis?
A different poster here, I have been searching for a picture of Warren Davis as well but can't find anything. I think this is odd. The media showed pictures of the shooter at the Discovery Channel by the next day, here it has been almost one month. Any idea why?