(CNN) -  Exiled Russian oligarch Boris Berezovsky's death is
"consistent with hanging" with no sign of a violent struggle,
British investigators announced late Monday.  The 67-year-old
Berezovsky was found dead at a country estate south of London
over the weekend, triggering speculation about the fate of a
onetime tycoon known for his opposition to Russian President
Vladimir Putin.  "The results of the post-mortem examination,
carried out by a Home Office pathologist, have found the cause
of death is consistent with hanging," Thames Valley police
reported. "The pathologist has found nothing to indicate a
violent struggle."  Investigators are still waiting for
toxicology test results, which could take several weeks, the
statement said. And the house in Ascot will remain under guard
while investigators continue to probe his death, police added.
He was found in the locked bathroom of a guest suite, police
confirmed. Police scouring the scene Sunday said had not found
any sign of "third-party involvement," a det