Khloe Kardashian is mourning the loss of Lamar Odom's best friend. The 'Keeping Up with the Kardashians' star is devastated after Jamie Sangouthai - who was one of the basketball star's best men at their 2009 wedding - passed away yesterday at the age of just 37 following a reported heroin overdose. Alongside a broken heart emoji, she tweeted yesterday afternoon: "When does it stop? RIP Jamie Sangouthai." Khloe's estranged husband is said to be "beside himself" by the loss of his former school friend and occasional business partner. A source told Us Weekly magazine: "Lamar is beside himself. This is the worst tragedy." Another source added: "This is so sad. They were best friends, like brothers. Lamar is going to take this really hard."