Collared Dove - damaged beak

Collared Dove - damaged beak

Observation - Collared Dove - damaged beak. Description: Does anyone have any thoughts on what has happened here? It seems that the top part of the bird's beak has moved down to below the bottom section. It wasn't always the case as obviously the bird is fully grown. The poor thing was found dying this a.m. I

Does anyone have any thoughts on what has happened here? It seems that the top part of the bird's beak has moved down to below the bottom section. It wasn't always the case as obviously the bird is fully grown. The poor thing was found dying this a.m. Is it a case of flying into something or a disease perhaps ? Thank you.