The rapper Lil Loaded has died at age 20.

He died on Monday, The Dallas Morning News reported, citing the Dallas County medical examiner’s office.

The cause and manner of his death have not been confirmed.

Ashkan Mehryari, an attorney for Robertson, called the death “very tragic,” The Dallas Morning News reported.

Robertson was arrested last year on a murder charge in connection with the shooting of his friend, 18-year-old Khalil Walker. He was indicted on the lesser charge of manslaughter in February of this year.