Helsius, Marvin Theodore
Navy Machinist’s mate 2

Marvin Theodore Helsius, age 23, from Lake County Painesville, Ohio .

Service era: Vietnam

Date of death: Wednesday, April 10, 1963
Death details: Killed aboard the atomic submarine Thresher when the ship went missing 220 miles East of Cape Cod, Massachusetts

Source: ussthresher.com, Associated Press (1963), oneternalpatrol.com