Karim, who is married to Daftary's sister, said Daftary had in recent months become more religious and believed suicide was a sin.
"There is no way on Earth she would commit this sin," he said. "Suicide was against all of her religious beliefs. She had recently started praying five times a day and was seeking comfort to get over this man, who was a pathological liar and had made her life extremely difficult."
Daftary was in Manchester helping a friend who was putting on a fashion show and family members believe she visited Jamil to seek a Muslim divorce.
Karim said the family supported Daftary leaving Jamil when they came to believe he was still married to another woman.
The family believed she might have been abused, but their suspicions were not supported by any documentation until police revealed that the woman had filed a sexual assault complaint in May 2008.
"An investigation was launched," the spokesman said. "However, the victim refused to cooperate further."
Calls by ABCNews.com to Jamil's home were answered by a man who identified himself only as "guest of Rashid" and who would not respond to questions. Later calls to the same number were not answered.
In 2007, Daftary, a Briton of Afghan descent, was crowned Miss Face of Asia, the U.K.'s largest beauty contest for Asian models. She had previously worked as a personal shopper at Harrod's, the London-based department store, where she helped wealthy Arab shoppers, but quit her job to study accounting.
Jamil led a lavish lifestyle and lived in a luxury apartment, but reportedly had been involved in a series of failed business ventures.
Photos from the couple's wedding ceremony show a well-dressed pair smiling for the camera and posing with family members.
But despite what looked like a typical and happy wedding celebration, the couple were never legally married, according to the police.
Daftary's family says the couple began having trouble a few months after the wedding ceremony when it was discovered that Jamil was living with another woman, believed to be his third wife Narisa Amjad, 29, and their two children, aged 4 and 1.
In 1996, he married Sebina Malik, currently 32, in a ceremony recognized under British law, but they divorced in August 2007.
Daftary's relatives also believe he may have been married once before in Pakistan.