Colt Brennan's Cause of Death Seems 'Darker' Than Previously Thought as New Details of QB's Last Days Emerged Colt Brennan's death played people's minds even more because of how the late quarterback spent his last days. Following the shocking news about Brennan being unconscious at a rehabilitation facility, new details that proved how dark his last days were began to emerge. In a new interview with Associated Press, Brennan's father Terry Brennan revealed that his son was actually out of the facility without their knowledge. It has been known that the 37-year-old decided to request a release on his own before calling for an Uber or a service vehicle.