Reality TV star Khloe Kardashian's ex-husband Lamar Odom is in a critical condition following his hospitalization on Tuesday (13Oct15).

The former professional basketball star, 35, was found unresponsive at the Love Ranch South brothel in Pahrump, Nevada on Tuesday, and he was admitted to a hospital in nearby Las Vegas.

Odom is in a coma and is breathing with the assistance of machines, according to TMZ.com, while he is also reportedly having "serious problems" with his heart, kidneys and lungs.

Kardashian, who split from the sportsman in 2013 after a four-year marriage, is said to by his side.

Odom has previously battled substance abuse issues and was admitted to rehab for treatment in 2013.

Police officers have conducted an investigation of the brothel, but details of their search had not been released as WENN went to press.