Authorities in Los Angeles have revealed the cause of the July 19 death of Slash’s stepdaughter Lucy-Bleu Knight at 25.

Los Angeles County’s medical examiner released a statement Thursday saying that Lucy-Bleu Knight’s cause of death was hydrogen sulfide toxicity, and that the ‘manner of death is suicide.’

Officials said that ‘Knight was found unresponsive in a private residence on July 19 by law enforcement conducting a welfare check,’ and that she was pronounced dead at 3 p.m. local time.

A deputy medical examiner conducted the exam on July 22, and certified the cause of death as of Thursday, officials said.

The Centers for Disease Control and Prevention website said that Hydrogen sulfide is ‘a colorless, flammable, highly toxic gas’ and that symptoms of acute exposure ‘include nausea, headaches, delirium, disturbed equilibrium, tremors, convulsions, and skin and eye irritation.’

Authorities in Los Angeles have revealed the cause of the July 19 death of Slash's stepdaughter Lucy-Bleu Knight (pictured) at 25

Authorities in Los Angeles have revealed the cause of the July 19 death of Slash’s stepdaughter Lucy-Bleu Knight (pictured) at 25

The veteran musician was pictured August 4 at the S.E.R.P.E.N.T. Blues Festival in NYC

The veteran musician was pictured August 4 at the S.E.R.P.E.N.T. Blues Festival in NYC

The CDC said that ‘inhalation of high concentrations of hydrogen sulfide can produce extremely rapid unconsciousness and death.’

The musical stalwart announced his beloved stepdaughter’s death in a heartbreaking Instagram statement on July 22.

‘My heart is permanently fractured,’ Slash said in an emotional July 27 post on Instagram, sharing a poignant selfie of Lucy-Bleu in which he detailed his grief. ‘I will never ever stop missing you & remembering what a beacon of happiness, laughter, creativity & beauty you have always been … & still are.’

He continued: ‘The brightest light in the lives of so many that loved you so much. I find solace in the hope that you are at peace now. I will love you eternally.’

Slash had canceled four tour dates of his solo S.E.R.P.E.N.T Tour to grieve his devastating loss.

Slash’s post announcing her death on Instagram read: ‘Lucy-Bleu Knight (December 6, 1998), beloved daughter of Meegan Hodges and Mark Knight, stepdaughter of Samantha Somers Knight and Slash, sister of Scarlet Knight, stepsister of London and Cash Hudson, passed away peacefully in Los Angeles, CA on July 19, 2024.’

The statement continued: ‘Lucy-Bleu was an incredibly talented artist, a passionate dreamer, and a charming, lovable, sweet soul.

‘The family asks for privacy at this time and requests that social media speculation be kept to a minimum as they grieve and process this devastating loss.’

In an emotional July 27 post on Instagram, Slash shared a poignant selfie of Lucy-Bleu and detailed his grief at losing her

In an emotional July 27 post on Instagram, Slash shared a poignant selfie of Lucy-Bleu and detailed his grief at losing her

Los Angeles County's medical examiner released a statement Thursday saying that Lucy-Bleu Knight's cause of death was hydrogen sulfide toxicity, and that the 'manner of death is suicide'

Los Angeles County’s medical examiner released a statement Thursday saying that Lucy-Bleu Knight’s cause of death was hydrogen sulfide toxicity, and that the ‘manner of death is suicide’

The veteran musician practiced his craft in the wake of the family tragedy

The veteran musician practiced his craft in the wake of the family tragedy

The November Rain performer was clad in a black Rolling Stones T-shirt with dark gray jeans and his signature top hat at the show in the Big Apple

The November Rain performer was clad in a black Rolling Stones T-shirt with dark gray jeans and his signature top hat at the show in the Big Apple

The Paradise City musician rounded out his ensemble with sunglasses, necklaces and Converse shoes as he took the stage at the venue

The Paradise City musician rounded out his ensemble with sunglasses, necklaces and Converse shoes as he took the stage at the venue

Slash was seen playing alongside musician Johnny Griparic on stage in Gotham

Slash was seen playing alongside musician Johnny Griparic on stage in Gotham

The Don't Cry musician had canceled four tour dates of his solo S.E.R.P.E.N.T Tour in the wake of the devastating loss

The Don’t Cry musician had canceled four tour dates of his solo S.E.R.P.E.N.T Tour in the wake of the devastating loss

Slash first dated Lucy’s mother Meegan Hodges in 1989 before rekindling their relationship years later in 2015. Meegan – who shared her late daughter Lucy with Mark Knight – also shared the same statement on her Instagram, penning: ‘I love you’

Lucy had 35,000 followers on Instagram and reportedly worked at Electric Lady Management, the talent arm of the recording studio.

Three hours after Slash posted the announcement, a selfie of Lucy alongside a caption was shared on her Instagram.

It read: ‘Whether I made you feel excluded, manipulated/ controlled you, told you to quit your day job from the comfort of being financially supported by my parents, or drowned real issues in toxic positivity-I am sorry.

‘Countless missed opportunities and connections due to a disgustingly big ego, insecure heart and fear of being vulnerable. May my soul learn to evolve from my poor job at being Lucy-Bleu. Peace.’

MailOnline contacted Slash’s representatives for comment at the time.

Hours before the tragic announcement, Slash canceled a series of tour dates due to ‘unforeseen circumstances’.

The message read: ‘Due to unforeseen circumstances, the S.E.R.P.E.N.T tour regrettably has to cancel the below performances. Refunds will be available at points of purchase.

‘The S.E.R.P.E.N.T tour will resume in Toronto on July 28, 2024 at Budweiser Stage. We love our fans and apologize for any inconvenience this has caused.’

Slash was sent condolences from his celebrity friends as he grieved

Slash was sent condolences from his celebrity friends as he grieved

Slash on July 22 shared the heartbreaking news that his stepdaughter died on Instagram

Slash on July 22 shared the heartbreaking news that his stepdaughter died on Instagram

Lucy pictured with a friend in June 2021

Lucy pictured with a friend in June 2021

Lucy and her mother Meegan Hodges were pictured in May of 2020

Lucy and her mother Meegan Hodges were pictured in May of 2020

Slash first dated Lucy's mother Meegan Hodges in 1989 before rekindling their relationship years later in 2015. Meegan shared her late daughter Lucy with Mark Knight

Slash first dated Lucy’s mother Meegan Hodges in 1989 before rekindling their relationship years later in 2015. Meegan shared her late daughter Lucy with Mark Knight

Three hours after Slash posted the announcement, a selfie of Lucy alongside a caption was shared on her Instagram

Three hours after Slash posted the announcement, a selfie of Lucy alongside a caption was shared on her Instagram

Hours before the tragic announcement, Slash canceled some tour dates due to 'unforeseen circumstances'

Hours before the tragic announcement, Slash canceled some tour dates due to ‘unforeseen circumstances’

Slash’s celebrity friends flooded comments with their condolences, with Dave Grohl’s daughter Violet penning: ‘My heart hurts for you guys. all the love to your family rn.’

Lenny Kravitz said on the platform, ‘My deepest condolences brother. And yes, she still IS! Love to the family.’

Tom Morello of Rage Against the Machine said, ‘Ahh I’m so sorry my friend. Love to you and family’ while Red Hot Chili Peppers bassist Flea wrote: ‘oh man, god bless.’

Slash’s Guns N’ Roses bandmate Duff McKagan’s wife Susan commented: ‘words cannot express our deepest sympathy and condolences. love you all so much.’

Others to offer condolences to the grieving musician included actor Jason Momoa, singer Fergie and ex-Headbangers Ball host Riki Rachtman.