Russell Armstrong found DEAD :( R.I.P

"Real Housewives of Beverly Hills" star Taylor Armstrong was at her estranged husband's house when his body was discovered, TMZ has learned.

Sources close to Taylor tell us, she and Russell had been regularly communicating and were supposed to meet on Monday afternoon, but he was a no show. She became worried and began calling his friends, but none of them had heard from him.

Taylor became increasingly alarmed and began frantically texting and phoning Russell, to no avail.

On Monday evening, Taylor and a friend went to the home where Russell was staying. They found the owner of the home on the property. While Taylor watched, the owner peered through Russell's bedroom window and saw his lifeless body hanging.

As TMZ first reported, the owner called 911 and Russell was declared dead at 8:16 PM. Taylor believes Russell had been dead for hours.

We're told Taylor stayed at the house for hours after the body was found.