Oh Kohnr was the name of a deceased Acamarian. An autopsy performed on the deceased person's body revealed the cause of death to be cardiac arrest. This arrest was attributed to a pulmonary embolism complicated by genetic predisposition.

In 2366, this individual was mentioned in the death records archives, which were accessible to the crew of the USS Enterprise-D via the Acamarian planetary database (TNG: "The Vengeance Factor", okudagram)

This character was only mentioned in writing.
Oh Kohnr might have been named after John O'Connell, a character from The Adventures of Buckaroo Banzai Across the 8th Dimension. There are several other in-joke references to characters from the movie in the records.