I can't find any record of him in Family Search or in Find-A-Grave. X-7764 01:22, 29 September 2018 (UTC)
I searched in the Washington State Archives - Digital Archives [1] and was unable to locate a death record. I searched for both H. R. Heisen and R. H. Heisen. King-9914 01:04, 5 October 2018 (UTC)
Searched FAG at the Gravel Point Cemetery (same cemetery as his mother) and at Crawford Cemetery (where his father is buried) and found nothing. In contact with FAG user: Stan R Lee who manages most of the Heisen memorials in Clark County, Washington about whether he has any information or a photo of the headstone if one exists. Also, did a wide open search at Washington State Digital Archives for the last name of Heisen with Soundex and searched at both FamilySearch and Ancestry for sources, none found. The date of death is so specific, it is either in family history or there should be a Washington State Death Record somewhere as it was being recorded in Clark County at this time in the Clark County Death Register 1891-1907. Some trees show his name as Roy. Azure Rae 19:27, 8 May 2019 MDT