Lamar Odom has exposed his dark childhood, as the son of a heroin addict.
The two-time Los Angeles Lakers championship star is set to make the emotional revelation in E!'s latest Kardashian sister spinoff, Khloe & Lamar.
"My father's a heroin addict," Odom said about his father, Joe, who makes a surprise cameo in the debut episode, when he turns up unannounced at wife Khloe's book signing.
"It's hard for me to speak upon it and get it through to Khloe because she grew up so different."
RadarOnline.com has a sneak peek of moment the 31-year-old detailed his painful upbringing in the episode, which premieres on Sunday, April 10.
Watch the video on RadarOnline.com
Odom said his relationship with his dad was now "complicated," as a result.
"Different from a normal father-son relationship," he admitted.
"I was six when my parents split up; I had my mother around until I was 12 (she passed away of colon cancer)... and after that my father wasn't around.
"I witnessed things that a 10-year-old definitely wasn't supposed to see."
Faced with being abandonment, Odom turned to his grandmother Mildred and the pair lived together in a rough neighborhood of Queens, NY.
Still, Odom said: "My father is definitely someone I'd do something for."
To see more of Odom's confession, Khloe & Lamar airs on Sunday at 10 p.m. (EST) on E!.