When his daughter Kathy found herself distressed with the negativity that she perceived in the world, David Hull said that he would tell her, "Just let it roll off your back like water off of a duck's back."
After she struggled with depression for many years, Hull said that he and his wife Jean began to see improvements in their daughters mood. "She was living on her own. She was paying all of her own bills. We thought that what she needed was space, and we just wanted to give that to her."
On the 26th of October, 2003, some time between 6:00 and 6:15 in the evening, Kathy took her own life by jumping from the Golden Gate Bridge.
Since Kathy's death, Hull has taken actions in hopes of ensuring that no parent will have to endure the same pain and despair that he faced. He believes that if Kathy would have been prevented during the single moment that she decided that she was going to commit suicide, then she would still be alive today.
Hull was one of the founding members and is the president of the Bridge Rail Foundation. The goal of the foundation is to work towards the construction of a barrier or net on the Golden Gate Bridge that would prevent suicidal people from jumping in the future.