On 2 May 2011, Alonso was arrested following his involvement in a car accident in Madrid. He was the driver of a car that collided with a wall, killing one of the passengers, a 19-year-old woman, having been driving at 112.8 km/h (70 mph) in wet conditions in a 50 km/h (30 mph) zone, with a blood alcohol level of 0.93 mg per millilitre of blood.
[31][32] He faced 21 months in prison when sentenced in February 2016, but his punishment was changed to a €61,000 fine and a driving ban of three years and four months, which had already been spent.