Police believe a serious mental illness was behind a Calgary mother's decision to hide and store the bodies of her newborn babies in her home.

The woman and the bodies of three newborns were found in a home in the northeast last October.

On Thursday, disturbing details are emerging about Simmi Khalon.

By all accounts she was a private person, but when police found her dead in her Taradale basement suite, they discovered something even more her troubling.

Khalon had hidden the bodies of two infant girls a baby boy in her home.

"The bodies were contained in airtight containers, inside suitcases, inside a closet in one of the rooms in the house," said Calgary Police Inspector Guy Slater.

Khalon died of complications from childbirth.

It's believed she gave birth to a child just weeks before her death and officers say she went to great lengths to hide her three pregnancies.

"Every indication is that Simmi's common-law husband, her co-workers, her family were unaware of her pregnancies," added Insp. Slater.

Police confirm that Khalon gave birth to a baby girl named Reet at the Peter Lougheed Hospital in 2005. It's not clear if the other two children were live births, but it's believed Khalon delivered those infants in her own home.

Forensic psychologist Dr. Thomas Dalby analyzed interviews with Khalon's family and friends.

He believes the mother of three suffered from a borderline personality disorder.

"It certainly was that she overreacted to situations and that she would be depressed and then the next day not, and that is again an indication of borderline personality disorder," said Dr. Dalby.

Dalby says serial infanticide is extremely rare, and he believes a chronic mental illness may be to blame in this case.

Neighbours who knew Khalon say she was a very quiet person.

The police investigation is now over, and officers admit they will likely never know how or why Khalon's children died.

Khalon's common-law husband is the father of two of the infants.

The father of the first child is not known.