The U.S. National Transportation Safety Board is confirming that famed Mexican-American singer Jenni Rivera died in a plane crash in northern Mexico.

It is the first official confirmation of Rivera’s death, although she has been widely presumed dead since the wreckage of her plane was found Sunday.

The NTSB is sending a team to assist Mexican authorities with the investigation. NTSB spokesman Keith Holloway says Mexican aviation authorities had confirmed Rivera’s death to the NTSB.