Bryan Randall, Sandra Bullock's partner, dies of ALS. What to know.

Bryan Randall, the long-term partner of Sandra Bullock, has died after a three-year battle with ALS, his family said in a statement to media outlets Monday.

The 57-year-old photographer opted to keep his journey with the rare neurological disease private, his family said, adding that they were grateful to the medical workers who had helped him. He died on Saturday.

Anyone can be affected by amyotrophic lateral sclerosis, also known as motor neuron disease or Lou Gehrig’s disease, according to experts. Notable athletes, politicians, entertainers and an estimated 200,000 people worldwide have had to manage the disease.

Here’s what ALS is and how it works:

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