Police Officer Siegfred Mortera, 49, suffered a fatal heart attack while participating in the Guam Police Department's SWAT training at Eagles Field.
He was leading a run of other SWAT team members when he suddenly collapsed at approximately 9:00 am. Another officer performed CPR until medics arrived at the location. He transported to Naval Hospital Guam where he remained unresponsive before passing away three days later, ODMP.org reports.
The tactical team was reportedly serving a warrant on the formerly licensed physician for practicing medicine without a license.