The actor (stuntman) survived with some broken ribs and internal bleeding. Last news report I heard indicated that he was in "critical but stable" condition at the (unnamed) hospital. Here's hoping he makes a full recovery.
Considering this incident along with some of the other problems (including injuries) that have plagued this production of late, one wonders if someone is trying to tell the show's producer's something. And it sounds like the plot of an episode of a mediocre TV mystery. I keep expecting Jessica Fletcher or the A-Team to show up to set things right...