Pieter Koomans drowned in 1864

Skipper Johannes Josephes Killian was living in Rotterdam and working as a skipper at a Dutch Ship named "Koning Willem III". He made a declaration that on September 3, 1864, around 23:00, he was sailing at sea at 52° north latitude and 3° east longitude, when purser Pieter Koomans, aged 24, fell overboard and drowned. He drowned in the North Sea.

Nieuwe Rotterdamsche Courant, 10-9-1863

Pieter Koomans was born on September 9, 1839, around 03:00 in Delft, as a younger son of Jacobus Koomans (1797-1874) and Anna Margaretha Wonders (1797-1860). His grandfather was Nicolaas Koomans (±1752-1829).
Pieter Koomans had two elder brothers: Hendrik Anthoon Koomans (1827-1861), who died childless, aged 33, and schoolteacher Nicolaas Koomans (1882-1910) who was married and had children, including professor Nicolaas Koomans (1879-1845).

Sources: Delft Archive, West-Brabant Archive, Delpher Newspapers, Huygens Knaw Resources.