Rehab Or Die: Troubled Lamar Odom Being Urged To Enter Rehab In Wake Of 2 Pals' Drug Deaths

The normally outspoken Khloe Kardashian is having a difficult time coming up with the words to express her pain over the loss of Bobby Heyward, who was close to both the reality star and her estranged husband Lamar Odom.

"Everyone who knew Bobby is still in shock and grief," a mutual friend of both Kardashian and Heyward tells RadarOnline.com exclusively.

"No one is leaving Khloe's side right now because she needs a lot of support to get through this, but right now she is inconsolable."

Heyward, a 30-year-old Los Angeles native, was found dead on June 22 — one week after Kardashian and Odom's world was rocked by the death of another mutual pal, Jamie Sangouthai, whose drug use also led to tragedy.

"Khloe was not as close to Jamie, but she was really good friends with Bobby," says the source. "She is being silent on the matter because she doesn't believe it was intentional."

However, as RadarOnline.com reported, although the autopsy report and toxicology report has yet to be released, L.A. County coroner Ed Winter said that law enforcement suggested Heyward died of an overdose.

"This is especially sad because he has been fighting really hard against his addiction to painkillers and alcohol," the source tells RadarOnline.com.

"Bobby was so talented and such an important role model," adds the source. "But he always downplayed his struggle with alcoholism because he didn't want to worry his friends."