Surattsville High School students on Thursday mourned the loss of a classmate who was killed this week when his car veered off the road and struck a tree.

Delante Clark, Jr., 17, of Clinton, was driving on Brandywine Road about 3 p.m. Wednesday when the crash occurred, Prince George’s police said. Police said Clark, who was wearing a seatbelt, was pronounced dead at the scene.

As of Thursday afternoon, the county police department’s collision analysis and reconstruction unit were still trying to determine why Clark left the roadway.

Clark was in several advancement placement courses including AP biology and AP language, school officials said. He was also a member of the school’s JROTC and played on the junior varsity football team for his first two years.

Surrattsville High School principal Kristi Holden said students made a large banner to memorialize Clark, decorated his locker and wrote sympathy letters that were delivered to his family. Grief counselors were on hand to talk to students.

She said Clark had a “very supportive family both at home and here at school.”

“I just know he was a nice young man with a quiet spirit,” Holden said. “Kids loved him and teachers loved him and we’re all being affected by this.”

Holden said Clark’s younger brother, a sophomore at Surrattsville, attended school Thursday to “try and stay focused, and to keep his mind off of what was going on.”