Legendary boxer Muhammad Ali died on Friday at 74, decades after he was diagnosed with Parkinson's disease. He had recently been admitted to a hospital in Arizona with serious respiratory issues, and family members rushed to his bedside as his condition deteriorated.
The Associated Press offers some answers to common questions about Parkinson's:
Q: What is Parkinson's?
A: Parkinson's is a neurologic disease that robs people of control over their movements. It typically starts with tremors, and is characterized by slow movement, a shuffling gait, stiff limbs, balance problems and slurred speech.
For much more on Muhammad Ali, see TIME’s ALI: The Greatest, a 112-page, fully illustrated commemorative edition. Available at retailers and at AMAZON.COM