The Biggest Loser trainer Bob Harper came perilously close to death when he suffered a heart attack in February 2017. The shocking health scare was seemingly unimaginable for Harper, who spent 18 seasons training contestants on The Biggest Loser to make their physical and emotional health a priority.

The former talk show host called out Leno after archival footage of him appeared in the Netflix docuseries, showing him reading death threats to Tracey Yukich.