Dallas Cowboys head coach Brian Schottenheimer addressed Marshawn Kneeland 's passing on Wednesday ... saying the team's "heart is heavy" as it deals with the loss -- while also revealing the late defensive end's girlfriend, Catalina , is currently pregnant with the couple's child.

The first-year head coach met with the media coming off Dallas' bye week ... and opened up his availability by offering condolences to Marshawn's family and his girlfriend as they navigate the difficult situation. Instagram / @szn.stitches

Schottenheimer said they had the opportunity to "celebrate" Kneeland's life Tuesday night ... and they were able to "tell some stories, share, laugh [and] cry."

"Marshawn loved the words one love, so we talked a lot about love as we grieved."

Schottenheimer sa

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