A German billionaire who vanished under mysterious circumstances under Switzerland’s iconic Matterhorn peak six years ago is suspected to be living with a Russian mistress in Moscow, an investigation has claimed.

German-American retail tycoon Karl-Erivan Haub, then 58, was training for a ski mountaineering race when he disappeared in April 2018 in Zermatt, Switzerland.

The billionaire businessman was last seen heading up the mountain in a lift one morning alone – something his trainer said was strange for a man who was typically very safety conscious and well-prepared – and never returned to his hotel. 

Authorities launched a six-day search which saw five helicopters and teams of alpine rescuers canvas the area, but his body was never found.

Haub – the former managing director and part owner of German supermarket and retail giant Tengelmann Group – was declared dead by a Cologne court three years later, leaving behind a wife, two children and a company of some 75,000 employees.

His younger brother Christian swore in a courtroom in 2021 there was no indication the Alpinist, whose net worth was estimated at £5.2 billion, remained alive.

But now a major investigation led by German broadcaster RTL claims to have identified Haub in Moscow – and believes the tycoon is there with a much younger mistress named Veronika Ermilova.

Christian is now subject to an investigation by the Cologne prosecutor’s office on suspicion of making false statements under oath, RTL reported. 

Christian assumed control of the Tengelmann Group after his brother’s disappearance, and claimed to have commissioned a security service to investigate the ‘rumours’ he was still alive.

His lawyer, Mark Binz, told German newspaper Die Zeit: ‘Of course there is nothing to the accusation.’ 

Retail mogul Haub, who would now be aged 64, is alleged to have called Ermilova’s phone 13 times in the three days before he vanished in 2018, according to the probe by RTL and media outlet Stern. 

The calls were substantial – one lasting more than an hour – leading to suspicions he was plotting to fake his death with help from Moscow and Ermilova. 

The investigation found that Ermilova, 44, ran an ‘inconspicuous’ event agency in St. Petersburg, which organised skiing, hiking and climbing excursions for outdoor enthusiasts – but she is also suspected of being involved with Russia’s FSB security service. 

She is now listed on LinkedIn as a Marketing Director at Russian Event, which is styled as a travel experience company. 

An investigation by Tengelmann later revealed that Haub’s life was closely intertwined with the enigmatic Ermilova, who is believed to be some twenty years Haub’s junior and was described as ‘a slim, athletic woman with shoulder-length brown hair, dark eyes, and open smile’.

Investigators suggested that she ‘may work for the Russian domestic secret service FSB’, although stressed this ‘cannot be proven’.

‘What can be proven, however, is that she is always in the same places at the same time as Karl-Erivan Haub,’ said the report.

‘In July 2008, both were in Moscow and Sochi within a few days… In May 2009, both travelled on the same night train from Moscow to St Petersburg, in separate compartments. The trips were booked at the same time and by the same person.

‘Strange too: [Ermilova] came to Moscow the day before just to take the train back home.

‘Further overlaps of short trips by Haub and [Ermilova] can be found for stays in Omsk (2010), Sochi (2011), Baku (2014) and Moscow (2015, 2017).’

The report states: ‘It is not clear why these alleged meetings took place. It doesn’t sound like a love vacation.’

RTL journalist Liv von Boetticher speculated that Haub’s disappearance in Switzerland and alleged appearances in Russia may have come as the result of shady business dealings.

‘Karl-Erivan Haub is known to have done business with questionable people in the Russian economy,’ she claimed. 

‘Our assumption is that business with Russia or with Russian business partners could have got Karl-Erivan in trouble in the West.’