Brosnahan said he knew Spade was having troubles and that she had been taking pills that he advised her not to take.
He also said his daughter would be glad if ongoing, global talk about her death were to have a positive impact.
"One thing we feel is that any talk that they do that helps somebody else, Katy would have liked that," he said. "She was always giving and charitable. If that helped anybody avoid anything -- fine, she'd be delighted."
For immediate help if you are in a crisis, call the toll-free National Suicide Prevention Lifeline at 1-800-273-TALK (8255), which is available 24 hours a day, 7 days a week. All calls are confidential.
If you are having thoughts of harming yourself or thinking about suicide tell someone who can help, such as a trusted loved one, your doctor, your licensed mental health professional if you already have one, or go to the nearest hospital emergency department.