The couple has been living separately for a long time, reports radaronline.com.
"They've had problems for a long time and have been separated for months," In Touch magazine quoted a source as saying.
"They haven't slept together in years and pretty much just have a business relationship at this point. Their marriage is over," added the source.
Since the ring is missing from her finger, Kris also didn't approve some promotional shoots for her talk show.
"There were also promos for her talk show that she (Kris) wouldn't approve because she realised she wasn't wearing her ring in them. She made sure they never saw the light of day," said the source.
The cause of their dying relationship is reported to be her fame-seeking attitude.
"He is so sick of the Kardashian machine and Kris' antics. He knows she's making him look foolish," said a source close to the athlete.
"This is a man who was called the best US athlete of all time. But he's so broken down. It's like Kris has sucked the life out of him," added the source.
--IANS (Posted on 02-09-2013)