A Gaithersburg man was killed when his pick-up truck struck a tree early Sunday.
Police say Jose Antonio Ayala, 49, was driving erratically near Route 108 and Hawkins Creamery Road in Gaithersburg around 1 a.m. when he ran off the road. He died on scene.
Ayala's family tells police he was a diabetic and depended on insulin.
The crash is being investigated.