Sources connected to the NBA star tell us people on Lamar's side, and on the Kardashian side have not been able to find Lamar or contact him for nearly 72 hours -- and we're told the main concern is he's hiding out while doing crack cocaine.
As TMZ first reported ... Khloe Kardashian threw him out of the house Wednesday after attempting an intervention which Lamar squarely rejected.
See this story on www.tmz.com
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