Search for Missing 16-Year-Old Child of Billionaire Slack Co-Founder Continues, Foul Play Not Suspected

The search for the missing 16-year-old child of the billionaire co-founder of Slack continues.

Mint Butterfield, who uses they/them pronouns, was last seen on Sunday, April 21, at approximately 10 p.m. in Bolinas, California.

Adam Schermerhorn, a public information officer with the Marin County Sheriff's Office, told PEOPLE on Thursday, April 25, that authorities are "still actively investigating leads and working with the juvenile's mother to try and acquire digital devices and other items that could have information."

Schermerhorn said authorities hope that Mint's personal belongings help provide information about their location or why they went missing.

He added that authorities "do not have any reason to believe there is foul play" or "anything criminal" in connection to Mint's disappearance.

According to a press release issued by the Marin County Sheriff's Office Thursday night, Mint is a "voluntary missing person."

Mint's mother, Caterina Fake, reported the teen missing after she discovered a note Monday morning indicating Mint had left.

"It is unclear how Mint left the area, as they did not have access to a vehicle, or phone," the sheriff's press release stated. "At this time, we have no information to believe that Mint was taken against their will. The Sheriff’s Office is considering Mint a voluntary-missing juvenile, who is “At- Risk” due to a reported previous threat of suicide."

Based on statements from Fake, authorities believe Mint may have traveled to the Tenderloin District of San Francisco. Officials told the San Francisco Standard that Mint "has a history of substance abuse and is known to frequent the Tenderloin." The neighborhood is located about 30 miles from where Mint was last seen in Bolinas. 

Fake and Mint also have a residence in San Francisco, but the sheriff's press release did not specify where.

As of Thursday night, the combined efforts of Marin County Sheriffs and the San Francisco Police Department to locate Mint have not been successful, per the press release.

According to the San Francisco Standard, Fake and her ex-husband, Stewart Butterfield, co-founded Flickr in 2004 before selling it to Yahoo in 2005. Following their 2008 divorce, Stewart co-founded Slack, which Forbes reports was acquired in July 2021 for $27.7 billion.

Although he left Slack in 2022, the business magazine estimates Stewart's personal wealth to be $1.6 billion.

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According to the Marin County Sheriff's Office, Mint is approximately 5'0" tall, has "brown/reddish curly hair," is 100 lbs, and has their eyebrows pierced. They were last seen wearing a "black sweatshirt, flannel pajama pants, and black boots."

Authorities ask that any information related to the whereabouts of Mint are directed to the Marin County Sheriff’s Office at (415) 479-2311 or email tips@marinsheriff.org

If you or someone you know is struggling with substance abuse, please contact the SAMHSA helpline at 1-800-662-HELP.