Jeff Byron
Age 40, Dallas

and

Greg Arceneaux
Age 54, Dallas

Steve Barrows
Age 33, Dallas

and

Roland Schurrer
Age 40, 2009

Interesting, and sad, that neither obituary below mentions that they were partners in life
I did not find separate obituaries for Byron and Arceneaux

For Schurrer, the obit above mentions a tribute site (still active) and below are selected photos from it

below are likely the two labs also lost in the plane crash