Mint Butterfield, the 16-year-old daughter of billionaire Slack co-founder Stewart Butterfield, is reported missing, police and local officials confirmed this week via the San Francisco Standard.

Caterina Fake, who co-founded Flickr with Mint's father, her ex-husband, initially reported her teenage daughter missing on Monday (April 22) after she was last been seen at 10:00 p.m. on Sunday (April 21) in Bolinas, according to Marin County Sheriff's Office spokesperson Deputy Jose Suarez. The missing teen had been living with her mother and attending a private boarding school in the Napa area at the time of her disappearance, the sheriff's office confirmed.

“Mint was last seen wearing a black sweatshirt, flannel pajama pants, and black boots,” sheriff’s officials said. “They were also possibly carrying a gray suitcase,” Suarez wrote in a statement via NextDoor.com.

Butterfield is, however, suspected to have run away to Tenderloin, a San Francisco neighborhood with a notorious reputation for having the highest levels of crime and homelessness in the city, as well as an open-air drug market. Butterfield is reported to have a history of substance abuse and had frequented the area in the past, according to the San Francisco Standard.

“Please contact Marin County Sheriff’s Office with any information on their whereabouts,” Suarez wrote.

Stewart Butterfield co-founded the popular messaging app Slack in 2013, but departed after it was sold to Salesforce for $28 billion in 2021 and is reported by Forbes to have a net worth of $1.6 billion. Fake founded the imaging service Flickr with her ex-husband and sold the company to Yahoo! for an estimated $30 million in 2004.

The couple was married in 2001, but divorced in 2007, the same year Mint, their only shared child, was born. Stewart Butterfield remarried Away co-founder and CEO Jennifer Rubio in 2020 and relocated to Aspen in 2021, while also owning multiple owns in New York.