This is what we found on Wikipedia regarding the Heathers the Musical:

Heathers the Musical, known colloquially as Heathers, is a musical by Laurence O'Keefe and Kevin Murphy, based on the 1988 film of the same name written by Daniel Waters. After a sold-out Los Angeles try-out, the show moved Off-Broadway in 2014, with US producers including J. Todd Harris, Amy Powers, RJ Hendricks, and Andy Cohen.

In the United Kingdom, a workshop of the musical at The Other Palace, London, held 5 sold-out presentations in the Studio from 30 May to 3 June 2017. The workshop featured Charlotte Wakefield as Veronica Sawyer and Jamie Muscato as J.D.

The show had its official London premiere in the Theatre at The Other Palace from June 9 to August 4, 2018, starring Carrie Hope Fletcher as Veronica Sawyer and Jamie Muscato as J.D. Produced by Bill Kenwright and Paul Taylor-Mills, directed again by Andy Fickman and with choreographer/associate director Gary Lloyd, the London production transferred to the West End at the Theatre Royal Haymarket, running from September 3, 2018, to November 24, 2018. A new song for Veronica, "I Say No", as well as a few script changes to Act 2 were added for the transfer. A West End cast recording was released on Ghostlight Records on March 1. The album debuted at No. 24 on the Official Albums Chart. The production won the 2019 WhatsOnStage Award for Best New Musical. Carrie Hope Fletcher also won for Best Actress in a Musical.

The musical returned to the West End with performances beginning on June 21, 2021, and ran at the Theatre Royal Haymarket until September 11, 2021. Heathers the Musical re-opened for a record-breaking season at The Other Palace in November 2021 after Bill Kenwright Ltd acquired the venue, where it ran until September 2023. The production toured across the UK and Ireland in 2021, 2023, and 2024 and returned to the West End in 2024 for a strictly limited season. BK Studios (the film and television company of Bill Kenwright Ltd) and Roku released the pro-shoot stage capture of the show, shot at The Other Palace in 2022, on their streaming service in the US in 2022, and it was released under Village Roadshow Pictures and Kaleidoscope Home Entertainment in the UK in 2023.

The musical returned to New York City at New World Stages in 2025. Originally a limited run scheduled to close September 28, the production has been extended four times, with a closing date of November 8, 2026.

The show is a high-energy black comedy and involves dark subject matter, including bullying, teen suicide, sexual assault, and school violence.