During the inquest, it was heard that 62 year old Julia was found hanged in the garage.
Her body was discovered by her husband Paul, who had been away visiting the couple’s daughter.
After becoming concerned when he could not get in contact with Julia while he was away, Mr Johnson cut his trip short and rushed back to their home.
The inquest revealed she did not leave a suicide note for her family and friends.
Paramedics from the South East Coast Ambulance Service declared Julia dead at 1.37am on 16 June, two minutes after arriving to her home.
The coroner ruled that Julia’s death was suicide after hearing she had been suffering from depression, but had been diagnosed by a psychiatrist as improving greatly.
At her last visit to the psychiatrist before her tragic death it was decided she was “settled” and her appointments were dropped to every six months.
Ruth, 59, and her TV presenter husband Eamonn Holmes, also 59, told viewers that Julia had died “after a long illness”.
At the time of Julia’s death, Ruth revealed her heartbreak over the death of her “kind and gentle” sister.
She took a break from her This Morning hosting duties as she tweeted: “My lovely Sis Julia has sadly died after a very long illness. My heart is completely broken.
“She was the kindest and most gentle soul and I will miss her forever.
“As I am sure you will appreciate I need to take time to grieve with my family. Thank you for your understanding.”
In August, Ruth temporarily walked off the set of This Morning after a phone-in triggered memories of her late sister.
During a phone-in, a viewer called to discuss their battle with anxiety with This Morning’s medical expert Angela.
As the listener discussed trying to break the cycle of anxiety and depression, Ruth disappeared off air after congratulating them for being brave enough to call in.
As the segment came to an end, Ruth’s husband Eamonn Holmes interrupted as he addressed her absence.
He said: “Obviously this is featured in Ruth’s life, she’s upset now and had to leave the studio because of her sister who was a chronic depressive.
“No matter what sort of help and medications, they didn’t seem to make much difference, there were good times and bad times.”