Lamar Odom and Khloé Kardashian had an altercation outside her gym in August

By Michele Corriston
Updated October 14, 2015 09:00 AM
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Credit: Jason LaVeris/FilmMagic

Khloé Kardashian has flown to Las Vegas to be by Lamar Odom‘s side after he was found unresponsive in a brothel.

Odom, 35, was hospitalized late Tuesday night. Kardashian, 31, rushed to join him in Nevada after learning of his condition.

Though the exes signed divorce papers in July, Kardashian has been vocal about how she will always love the former NBA player, who she wed on national TV in 2009 just one month after meeting, and defended staying in touch with him after his infidelity and drug abuse ended their marriage.

Their last known encounter was in August, when Odom confronted the Keeping Up with Kardashians star outside her L.A. gym. Though Odom denied ambushing or harassing her, a source told PEOPLE that he “had issues” with Kardashian dating Houston Rockets shooting guard James Harden.

Odom “had a hard time letting go of Khloé,” an insider told PEOPLE.

Despite being “very upset” about the “scary” incident, a a source said Kardashian was “worried about Lamar.”

“He is clearly not well,” the source added.