Dallas Police officer Joseph M. George died on Tuesday, Dec. 24 after injuries he sustained from an off-duty car accident Sunday.

George was driving at a high speed before his vehicle crashed into a tree near White Rock Lake. On Thursday, police officials were still looking for a white Suzuki coupe they believe was racing with the officer on Sunday, according to Dallas News.

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George was a four-year veteran of the department. He worked at the Northeast patrol division.

The investigation is still ongoing.

Anyone with information about the crash or the two-door Suzuki may call Detective K. Land at 214-671-0014 or Detective J. Massey at 214-671-0012.