As the brother of tennis legend Steffi Graf and the brother-in-law of Andre Agassi, Michael Graf spent years living in the close orbit of sporting royalty.
Now, the 55-year-old spends his days chronicling a dramatically different existence, from inside the dangerous flood drainage tunnels beneath Las Vegas – where he is reported to be living homeless while on the run from the law.
A network of social media accounts, unearthed by the Daily Mail, paints the most troubling picture yet of his life underground.
He has posted hours of increasingly bizarre videos from his makeshift encampment – surrounded by graffiti, trash and a shopping cart crammed with his belongings – while ranting about his famous relatives, family feuds and ongoing legal woes.
It is unclear when the footage was filmed but the clips, uploaded all hours of the day and night, show a disheveled Graf resting on a dirty mattress, surviving on sparse food and admitting to scavenging cigarettes and other items off the street.
Among Graf’s rambling video monologues are several rants about his long-standing rivalry with Agassi, who he describes as his ‘beloved brother-in-law’ and a ‘total a*****e.’
In other videos, he repeatedly attacks his estranged second wife, Paullette ‘Christine’ Deruelle, 53, accusing her of ruining his life and having him arrested multiple times, while telling viewers he is ‘homeless’ and has ‘nothing to lose.’
Graf has continued to post regular video updates in recent days despite a warrant remaining outstanding for his arrest, filming everything from meals at McDonald’s to visits to his self-storage unit to musings on why Agassi’s spirit animal would be a panther, panda or swan.
Michael Graf, the brother of tennis legend Steffi Graf, has been broadcasting his new life in the dangerous flood drainage tunnels of Las Vegas (Source: Mike Graf/Facebook)
A bench warrant is out for Graf’s arrest, due to him missing a status after he was arrested for a DUI (Source: Mike Graf/Facebook)
Las Vegas’ tunnel network provides shelter for as many as 1,500 homeless people, many of whom live with grave mental illness and drug addiction, but have become increasingly dangerous since allegedly violent drug gangs have moved in
One video from the past few days shows him picking up ‘hollow-point’ bullets off the ground, saying they ‘could be useful,’ while another reveals water rushing through the tunnel and over what appears to be his belongings.
Graf’s videos suggest he has been living in a concrete tunnel in Summerlin, an upscale neighborhood in Las Vegas, where he moved from Germany years ago to be closer to his 57-year-old sister and their mother, Heidi, 82.
The Daily Mail has learned his apparent hideout is just a short drive from the three-bedroom home he once shared with Deruelle, a property bought for him by his sister and her husband after Graf had a series of violent public meltdowns in 2020.
The home, owned by an LLC managed by advisers to Agassi’s business empire, was put on the market for $579,000 in May and has since been reduced to $557,500, we can reveal.
Graf and Deruelle, an attorney, lived in the home together until September 2025, when they separated after less than two years of marriage.
In January, Graf was arrested for trespass not amounting to burglary, a criminal misdemeanor, after going to their former marital home in breach of a temporary domestic violence protection order his wife had in place. He initially pleaded not guilty before changing his plea to no contest.
He was later released on the conditions that he obey a court order not to contact his estranged wife in person or on social media and to stay out of trouble, and told that the misdemeanor charge would be dropped if he followed these orders.
Graf then filed for divorce, citing incompatibility, and demanded Deruelle pay him $7,500 a month in spousal support for two years, according to court papers obtained by the Daily Mail.
A water management system, the Las Vegas tunnels are designed to carry rain water off the streets – which can lead to flash floods in the system, with debris rushing through
Las Vegas’ network of storm channels and tunnels measures more than 600 miles in total
The tunnel system has become a haven for drug dealers, the Daily Mail is told, as well as the homeless
Graf asked the judge to let him fire his lawyer and regain possession of the home.
In an emergency motion, he wrote: ‘I am currently displaced and on the street in freezing temperatures… I have no other shelter, my ID and life-saving belongings have been denied, and the property is currently vacated by [Deruelle].’
Graf’s divorce petition was dismissed without prejudice in May. Deruelle, who now appears to be living in Florida, did not respond to a Daily Mail request for comment.
The couple have no children together. Graf shares four adult children with his first wife, Elaine, who divorced him in 2012.
Meanwhile, in March, court records show he was arrested by Boulder City Police in Nevada for a DUI, in violation of the order to stay out of trouble.
The Boulder City Police Department previously told the Daily Mail Graf was arrested on February 12, 2026, after an open alcoholic container was found in his vehicle.
After he failed to appear for a status check on March 26, a bench warrant was issued for his arrest and remains active.
Since then, Graf has documented a nomadic lifestyle online, claiming he lived in the desert and, later, out of his Tesla while camped at Lake Mead, Nevada.
Earlier this month, a homeless person was killed in flash floods that regularly sweep the channels of the Last Vegas tunnel system
Siblings Michael and Steffi Graf (front row) with their parents, Heidi and Peter, in Florida around 1989
In Graf’s sometimes bizarre social-media videos, he speaks about his sister, Steffi, and her husband, Andre Agassi (Source: Mike Graf/Facebook)
But he claimed his camp later burned down in a fire, and he crashed his Tesla in September.
His videos from the subterranean channels beneath Las Vegas began on October 12.
And many of the clips suggest no love is lost between him and Agassi, 56.
In a previous video, Graf sensationally claimed he got into a physical fight with his brother-in-law, who ‘enjoyed hitting me as hard as he could.’
Graf said he retaliated by giving Agassi a ‘good whack’ and pinching his nipples. There is no evidence the incident occurred and the Daily Mail previously contacted Agassi’s rep for comment and did not hear back.
In other videos, Graf accuses Agassi of deliberately ‘pressing my buttons’ during their alleged years-long rivalry.
In one bizarre video, Graf claims there is a ‘long-standing feud’ between him and the eight-time Grand Slam champion over the latter’s previous co-ownership of the Golden Nugget in downtown Las Vegas.
‘Andre was a partner at the place, and he gives it to one of the weird people in town. I’m like “Why”? I was almost there, and he pulls the rug out from my feet,’ claims Graf in the video.
Graf formerly shared this home with his ex-wife in Summerlin, Nevada. He recently said he is ‘displaced’ and living on the street
Graf previously posted about living in his Tesla, camped out on the shore of Lake Mead. But after crashing it in September, he’s been getting around on a bicycle (Source: Mike Graf/Facebook)
In times of emergency, flyers encourage people to leave the tunnels – warning that forecasted heavy rains could cause flash floods
Other footage, meanwhile, is particularly unsettling. In one clip, Graf brandishes a rusted flick knife he says he found, calling it ‘the only weapon at hand,’ while in another he goes on an erratic political rant while surrounded by what appears to be aluminum foil with black marks. While aluminum foil can be used with a flame to heat and inhale drugs such as fentanyl, heroin or meth, it is unclear if Graf used the foils himself for any reason.
In one recent video filmed inside his storage locker, he pans the camera towards what appeared to be his daughter Talia’s birth certificate, telling viewers: ‘If anyone’s in contact with Talia, I have her birth certificate.’
In others, Graf displays what appears to be his mother Heidi’s passport, as well as Mercedes car keys.
In one clip, Graf boasts he is a ‘really good fighter’ and how he once ‘wanted to fight Mike Tyson because I was trying to take his ex-wife out on a date, just to p**s [him] off.’
Another shows Graf, a self-described ‘multimedia producer’ and ‘hacker,’ boasting there is ‘not a single computer system’ he cannot hack and that he is one of the best hackers in the world.
According to some of his videos, Graf emerges from his apparent hideout late at night, cycling on a neon-colored Trek bicycle to nearby strip malls to buy groceries or to access a storage unit where he is keeping the bulk of his possessions, before retreating into the tunnels.
The Daily Mail identified a location featured in Graf’s videos but was warned against venturing deep inside the dangerous 600-mile-long tunnel network by some of its homeless occupants and the grassroots groups that help them.
Just days before it was reported that Graf was living underground, a homeless person was killed in flash floods that regularly sweep the channels, according to Brent Nowak of Shine a Light, an organization that offers willing tunnel residents a two-year recovery program.
Married tennis legends Steffi Graf and Andre Agassi are both the subjects of her brother’s social media ramblings
One of Graf’s videos details his long-standing rivalry with Agassi, who Graf describes as his both ‘beloved brother-in-law’ and a ‘total a*****e’
When the Daily Mail visited recently, scores of people were fleeing the underground dwellings, where flyers warning of impending heavy rains and flash floods had been posted to entrances by homeless charities.
Shine a Light protects tunnel residents’ privacy and does not ‘help locate missing persons’ for law enforcement or anyone else who might be looking for them, Nowak told the Daily Mail.
A man named Chad, 39, who lives close to one of the main channels which stretches underneath Caesars Palace and the Linq Hotel, said he hadn’t seen Graf in the tunnels but believed police would quickly find him if he was a ‘serious priority.’
‘They come through these tunnels regularly. I’ve seen the cops three times in the past couple of weeks.
‘If you’re coming in and out of the tunnels, you’re not going to be able to avoid surveillance.’
There are daily dangers for the tunnel network’s 1,500 homeless occupants, many of whom live with grave mental illness and drug addiction.
Some parts of the underground network have been taken over by allegedly violent drug gangs and have become a no-go-zone for most, said Bonny, a long-time tunnel resident who, like other tunnel-dwellers, asked to withhold their last names.
The 62-year-old and a male friend claimed they had seen Graf ‘two or three months ago’ with his bike and a backpack, and that he allegedly asked them where he could buy fentanyl. It is unknown if Graf has a history of drug use.
Bonny claimed Graf did not reveal anything about himself, but she believed he was living in the tunnels on the western side of Las Vegas.
His apparent descent into homelessness in the tunnels comes six years after his arrest for violent outbursts in Las Vegas in 2020.
At the time, his sister, a 22-time grand slam champion, supported him, buying him a house and reportedly paying for lawyers as well as seeking temporary legal guardianship, according to a report in Blick.
Today, that home is on the market and it remains to be seen how long Steffi Graf’s little brother will remain in the tunnels beneath the streets of Las Vegas.
Graf and a lawyer believed to represent him did not return the Daily Mail’s requests for comment.
