Lamar Odom is not taking the death of his best friend well.
As reported last night, Jamie Sangouthai died on Sunday of a rumored drug overdose, passing away at a hospital in Los Angeles after someone found his unconscious body and called 911.
The 37-year old had known Odom since high school and worked with the estranged husband of Khloe Kardashian on a number of business projects.
While the ex-athlete is yet to address the tragedy, a source tells Us Weekly that he's "beside himself" with grief, and "really shaken" by the death of his close pal.
"When he found out Jamie died, he was devastated," the insider tells the tabloid of Odom, who was partying in Las Vegas when he received the sad news.
Along with various business deals, Odom and Sangouthai had a history of simultaneous drug use.
Many believe Sangouthai helped fuel Odom's most recent drug binge, which contributed to his eventual split from Khloe.
The good friends even made a very strange video aimed at Kardashian in 2013, one in which both were clearly on some kind of illicit substance:
"He feels like it could have happened to him. This is a huge wake-up call for him. It has really shaken him," the source added to Us.
Sangouthai appeared on episodes of Khloe & Lamar and also on a few installments of Keeping Up With the Kardashians.
Following Sangouthai's passing, Kardashian took to Twitter to pay homage to her friend, posting a broken heart emoji and the message:
"When does it stop? RIP Jamie Sangouthai... Life doesn't get easier but I promise you that life will make you stronger."
Concludes the magazine insider:
"They were best friends, like brothers. Lamar is going to take this really hard."