Entertainment TV 'Toddlers & Tiaras' Alum Kailia Posey's Death Being Investigated by Washington Authorities The Whatcom Sheriff's Office in Washington state confirms to PEOPLE they are part of a multi-agency investigation related to the death of Kailia Posey By Chelsea White and Shafiq Najib Published on May 3, 2022 06:42 PM Share Tweet Pin Email Investigations have begun in the death of Toddlers & Tiaras star Kailia Posey. The Whatcom County Sheriff's Office confirms to PEOPLE it is part of a multi-agency investigation related to the death of the 16-year-old former TLC star. Washington State Patrol could not formally confirm the identify the subject of the death investigation as the individual is a juvenile, but did confirm to PEOPLE it is involved in an ongoing death investigation. Washington State Parks Department also confirmed the investigation to PEOPLE. Kailia Posey Facebook Washington State Patrol Public Information Officer Trooper Jacob Kennett tells PEOPLE: "Yesterday on May 2 at about 1:26 p.m., Washington State Patrol was called to assist Whatcom Sheriff's department to assist in a death investigation involving a minor at Birch Bay State Park." Trooper Kennett adds it is an ongoing, multi-agency investigation. Other agencies involved include the Washington State Parks Department and the Blaine Police Department, where the park is located. PEOPLE has not yet received responses from the Blaine PD or the Whatcom County Medical Examiner. Toddlers & Tiaras Alum Kailia Posey Dead at 16: 'A Beautiful Baby Girl Is Gone' Kailia Posey in Toddlers & Tiaras. TLC On Monday, Posey's mother, Marcy Posey Gatterman, confirmed the news of her death via Facebook. She was 16. At the time, Gatterman shared a photo of Posey dressed in the sparkly gown she wore to prom last month. "I don't have words or any thoughts," Gatterman wrote. "A beautiful baby girl is gone. Please give us privacy as we mourn the loss of Kailia. My baby forever." Gatterman has not confirmed the cause of Posey's death, but she has since updated her profile photo and cover image to honor her late daughter. For the profile image, she uploaded a photo of Posey as an angel. PEOPLE has reached out to TLC for comment. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Hours before confirming Posey's death, Gatterman said the teenager was supposed to be "graduating with honors" next month. Posey was best known for appearing on TLC's Toddlers & Tiaras, which originally aired from 2009 to 2013. The high schooler was 5 years old when she appeared on one episode of the reality series, which saw her compete in the California Tropic Arizona pageant, and she became one of the series' most recognizable faces after her reaction in an interview became a popular gif. TLC The Cast of Toddlers & Tiaras: Where Are They Now? Posey continued to compete in pageants after her brief stint on the show. In January, she announced she was competing in Miss Washington Teen USA in February. "One word. Thankful," she captioned a post on Instagram. On Sunday, Posey had launched an Instagram account dedicated to showing off her contortion skills. However, her final post on her primary account was a photo of herself posing in a colorful, red outfit. She captioned the pic, "None of your concern :)."