Authorities are investigating the death of a 61-year-old bicyclist who was fatally struck by a vehicle in Lincoln on Thursday evening.

Eugene Thornberg, of Wayland, was pronounced dead at the scene, the office of Middlesex District Attorney Marian T. Ryan said in a statement on Friday. Thornberg was struck at about 5:15 p.m. on Concord Road, which is also Route 126, Ryan’s office said.

The driver remained on the scene, according to the district attorney’s office. The incident is under investigation by Ryan’s office and State and Lincoln police.