According to the British Armed Forces and overseas deaths and burials (a combined index for the UK),
his death was reported to The Registrar General for Scotland.
He was 29, a 3rd engineer, Nationality or Birth Place British, Greenock, last place of abode Mrs Vokes, 9 Dellingburn St., Greenock, Scotland, Cause of Death Drowning, assumed suicide, date of death 05 June 1909, place of death Newport News, USA. Ship was Strathfillan (a steam ship), official no.121,341, registered in Glasgow.
As the death was reported to Scotland, their local marine return which will include him is available on Scotlands People - search with his name and year of death 1909.
I'd doubt if they would have issued an official death cert as he didn't die in Scotland. Just two entries on SP showing, both listed as Marine Returns
Boo