From Entertainment Weekly:

HBO has decided to cancel Luck following the death of a third horse on the series.

The network released this statement:

“It is with heartbreak that executive producers David Milch and Michael Mann together with HBO have decided to cease all future production on the series Luck. Safety is always of paramount concern. We maintained the highest safety standards throughout production, higher in fact than any protocols existing in horseracing anywhere with many fewer incidents than occur in racing or than befall horses normally in barns at night or pastures. While we maintained the highest safety standards possible, accidents unfortunately happen and it is impossible to guarantee they won’t in the future. Accordingly, we have reached this difficult decision. We are immensely proud of this series, the writing, the acting, the filmmaking, the celebration of the culture of horses, and everyone involved in its creation.”

The American Humane Association is currently investigating the show’s Southern California set. The show’s final two episodes will still air.!/mousterpiece/status/180067810599374850!/daveweigel/status/180070926740762624!/benhjacobs/status/180071625146892288!/infamous/status/180072995551854592!/Ann_lopez/status/180073167107272704!/GBProbst/status/180073130348396544!/HarveyLevinTMZ/status/180069794073161728!/_joshpeterson/status/180074145529335808!/jerjacobson/status/180074137967013888!/JimmyUnit/status/180068256227401728!/slapclap/status/180044453564792833!/singingherpes/status/180070554945069059!/AngeGold/status/180073683237343232!/michaelianblack/status/180073883972538369