Students at St. Thomas High School are mourning the loss of a fellow classmate after the teen was killed in a car crash.

School officials said high school senior Dennis Duffy was killed in a car crash Sunday. Students gathered at the high school’s chapel for a private prayer service to remember Duffy and cope with this tragic accident.

“He was a great guy, very influential. I considered him to be one of my best friends and a brother,” said one student.

Investigators have yet to say how the accident unfolded. School administrators say they plan to have counselors on hand Monday to help console students.

No other information regarding the accident has been released.