Corporal Ashley Bernard Nickless was found hanged in his home in Llysfaen, Wales, by a friend who became concerned after he sent a worrying text message in November 2019.
Police and the emergency services scrambled to save his life on November 22 but he was tragically pronounced dead, an inquest in the town of Ruthin heard today, September 30.
The 31-year-old joined the Royal Marines Commando in 2007, the Daily Post reports.
He saw friends killed while on a tour in Afghanistan, and was left with shrapnel in his arm.
Mr Nickless, who was born in St Asaph in north Wales, was discharged in 2017 with PTSD, and continued to experience mental health problems including flashbacks, panic attacks and nightmares.
He had also spilt from his partner.
Mr Nickless suffered issues with anxiety and paranoia earlier in his life and after his military discharge, his family became "scared of his behaviour", the hearing heard.
The marine had mounting debts and there had been recent incidents where he had tried to take his life – in October and November 2, 2019.
Following his death, TV presenter Ross Kemp, who met Cpl Nickless in Afghanistan, wrote: "More needs to done to help ex-service people with mental health issues, particularly those with PTSD."
Mel B said Cpl Nickless had become "part of the family".
The inquest heard that Mr Nickless had raised issues trying to access GP services before his death.
His family, who were present at the hearing, questioned why he had not been sectioned or given better support.
Three notes were found in his home, which assistant coroner for North Wales east and central, Elizabeth Dudley-Jones, said left her satisfied Mr Nickless had intended to take his own life.
She recorded a conclusion of suicide.
Dr Andrew Dalton, who carried out the examination, concluded he died of asphyxiation.
In a funeral notice published in the Daily Post newspaper, his family described him as a "devoted daddy", as well as a "cherished husband of Katie, much loved son of Melvin and Amanda, dear step-son of Claire, [and] loving brother of Amy and Thomas".
It added he was a "step brother to Leoni and Kylie, dear brother in law of Jason and fond uncle."
A statement by the family at the inquest said: "He will be sadly missed by us all."
For emotional support, you can call the Samaritans 24-hour helpline on 116 123, email [email protected], visit a Samaritans branch in person or go to the Samaritans website.
Click here to read NHS guidance on treating PTSD.