Webaccording to reuters, arness died on june 3, 2011, of natural causes at the age of 88 in los angeles, california. Webon june 3, 2011, at the age of 88, arness died of natural causes in his brentwood home in los angeles, california. His business manager, ginny fazer, said he was in relatively.

James arness had an estimated net worth of $8 million at the.