VIDEO: According to a press release from the City of Walla Walla, Engineer Ryan Pleasants' cause of death is confirmed to be a "significant cardiac event" following an autopsy. The press release notes that contributing factors included physical and mental stress from work. A memorial service for family and close friends is scheduled for Jan. 24. A public service will be held on Jan. 27 at 1 p.m. at the Walla Walla Community College Dietrich Dome.