Lamar Odom's best friend, Jamie Sangouthai, died from a drug overdose on Sunday, according to a source for Us Weekly.

"Lamar is beside himself. This is the worst tragedy," the source told Us. "This is so sad," another source added. "They were best friends, like brothers. Lamar is going to take this really hard."

Just after the news broke, Khloe Kardashian tweeted, "When does it stop? RIP Jamie Sangouthai," and a few hours later she posted an Instagram photo of a woman crying and wrote, "Life doesn't get easier but I promise you that life will make you stronger." Khloe's BFF Malika Haqq posted the above photo with Odom, Kardashian and Sangouthai and added, "Thru good and bad times life shows us every spirit matters and leaves a print on the hearts of others after they have passed... RIP Jamie Sangouthai #GodHelpUsAll."

Lamar and Khloe have yet to finalize their divorce (she filed in December 2013), and there have been all sorts of reports lately that the two are reconciling. In fact, In Touch Weekly claims that Lamar turned down a $1 million offer to return to Keeping Up with the Kardashians. "He disappears regularly and is basically homeless. His friends are worried that he will never get his act together," a source tells the mag.

Sounds like he needs Khloe now more than ever...