U.S. Navy SEAL candidate Kyle MullenA second candidate, who had just completed Hell Week (the “first phase” of the Navy’s SEAL selection and assessment pathways) was also hospitalized in California. 

The press release states that the two U.S. Navy SEALs, assigned to Naval Special Warfare Basic Training Command (NSWTC), were taken to the hospital for “several hours” following the completion of Hell Week by their Basic Underwater Demolition SEALs (BUD/S). According to NBC News SEAL candidates go through intense training and have little sleep throughout Hell Week.   

According to the release, “The Sailors did not report symptoms while they were actively training” and “were transported for emergency care.”

The press release stated that one candidate was transported to Naval Medical Center San Diego. He is now in stable condition. The other—Mullen from Manalapan, New Jersey—was taken to Coronado Hospital in Coronado, Calif., a release stated, where he was pronounced dead at 5:42 p.m. that day. He was only 24 years of age.

According to the release, “the cause of his untimely death is not yet known.” An investigation into this matter is under way.