LONDON (AP) — A British judge says a wealthy Russian businessman who collapsed near his home outside London died from a heart attack.

Alexander Perepilichnyy collapsed while jogging in November 2012. Police initially said the 44-year-old died of natural causes, but foul play concerns increased after ex-Russian spy Sergei Skripal was poisoned with a nerve agent in the English city of Salisbury earlier this year.

Perepilichnyy had been helping Kremlin critic Bill Browder expose an alleged $230 million Russian tax fraud before he died.

Judge Nicholas Hilliard, who oversaw a long-running coroner's inquest into the death, concluded Wednesday that "it is more likely than not he had died from natural causes," namely sudden arrhythmic death syndrome.

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He said the other potential cause of death, poisoning, couldn't be ruled out but was "unlikely."