Fire was set to cover up evidence , U.S. Navy says . Seaman James Provost 's death being investigated as murder . Congressman calls for investigation of possible hate crime . Body was discovered at 3:30 a.m. , during Provost 's time on sentry duty .
Fire was set to cover up evidence , U.S. Navy says . Seaman August Provost 's death being investigated as homicide . Congressman calls for investigation of possible hate crime . Body was discovered at 3:30 a.m. , during Provost 's shift on sentry duty .