How many MMA fighters have died in the ring?

Related questions

1. Who has most KO's in UFC?
2. Do boxers make more than UFC fighters?
3. What does MMA consist of?
4. Is UFC dangerous?
5. How many hours a day do MMA fighters train?
6. What is the MMA ring called?
7. Can getting choked out cause brain damage?
8. Are there belts in MMA?
9. What was the first MMA fight?
10. Do MMA fighters get brain damage?

Tags

1. #result
2. #approximately
3. #boxers
4. #estimated
5. #since
6. #injuries
7. #alone
8. #february
9. #following
10. #introduced
11. #sustained
12. #rules
13. #marquess
14. #boxing
15. #deaths
16. #queensberry