Cory Monteith's Family Tragedy: Late 'Glee' Star's Parents Both Die Within a Month of Each Other — Nearly 12 Years After Actor's Drug Overdose

More tragedy has befallen former Glee star Cory Monteith's family.

The late actor's mother Ann Marie McGregor passed away on June 18, a little over a month after his father Joe Monteith died, RadarOnline.com can reveal.

Cory lost his battle with addiction in 2013. He was 31-years-old.

An Instagram page honoring Cory, which was set up by his mother, confirmed her death in a heartbreaking post, announcing: "Cory and Ann are now reunited."

Ann reportedly passed away "peacefully" at the age of 74 following a long illness. She was remembered for her "strong character."

Her obituary read: "Ann enjoyed her time gardening, along with her artistic pursuits on her acreage in Shirley, BC, together with Cornelius, Harley and her lovebirds.

"Ann was a person of strong character, and she carried that throughout her life."

The online tribute expressed gratitude to Ann's "close friends and acquaintances who have been there to support her over the years," as well as "the doctors, nurses and palliative care staff at St. Paul's Hospital in Saskatoon for the impeccable care Ann received while there."

Shortly before Ann's death, Cory's father Joe passed away on May 12 aged 75 in Canada. His family reportedly confirmed he died following a prolonged hospital stay in New Brunswick.

His obituary stated: "Joe created a beautiful life in which he was a beloved husband, father, brother, grandparent, and great grandparent."

Cory's father was a retired veteran from the Canadian Armed Forces, serving his country for 25 years. After his retirement, he "could be found spending his summers at their trailer on the Canaan River alongside many friends who will miss him deeply."

The obituary continued: "Joe was always surrounded by friends, family, and the many four-legged fur babies that he and Yvette rescued from the SPCA. His love and positive outlook on life will be missed by all of us.

"Joe will forever be remembered by friends and family for his witty sense of humour and love for baseball."

The death of Cory's parents comes nearly 12 years after their son died on July 13, 2013.

Cory was discovered unresponsive in his room at the Fairmont Pacific Rim hotel in Vancouver by staff who went to check on him after he failed to check out on time.

A preliminary autopsy report stated the Monte Carlo star died of "mixed drug toxicity" from heroine and alcohol, which appeared to be accidental. A final report, issued by the British Columbia Coroners Service in October 2013, confirmed the preliminary autopsy findings.

Codeine and morphine were also noted as being present in the actor's system at the time of his death.

Drug paraphernalia, including a spoon with drug residue and needles, and two bottles of champagne were discovered in Cory's hotel room.

Cory struggled with substance abuse and addiction from the age of 13. He first sought treatment for substance abuse when he was 19-years-old.

Shortly before his death, Cory checked into rehab in March 2013 for substance addiction.

Two years after his death, Ann established the charity Cory's Law in his honor. The charity aimed to continue the actor's "legacy of helping others, giving back and supporting young people by providing opportunities through performing arts."