The Tragic Life Of William Kyne's Third Wife, Tonya: Business Director, True Crime Footnote, And Her Battle With Cancer

The story of William "Bill" Kyne's life is a complex and often tragic narrative, one that has been repeatedly scrutinized by true crime enthusiasts and media outlets like Dateline. While much of the public focus remains on the suspicious deaths of his first two wives, Krista and Diane Kyne, the life and ultimate fate of his third wife, Tonya, often serves as a quieter, yet equally poignant, chapter in this controversial saga. As of December 14, 2025, the details surrounding Tonya Kyne (née Grass) paint a picture of a woman who married a figure of public controversy and ultimately lost her life to a devastating illness.

Tonya Kyne's tenure as Bill Kyne's wife and business partner was shadowed by the unresolved mystery of Diane Kyne's 2010 murder and the earlier death of Krista Kyne in 2000. Her own passing in 2017, though attributed to cancer, added a final, somber layer to a family history already marked by profound loss and public suspicion. This article provides a deep dive into the known facts about Tonya Kyne, her relationship with William Kyne, and the circumstances of her untimely death.

Tonya Kyne (née Grass) - Biographical Profile

Tonya Kyne, known before her marriage as Tonya Grass, became William Kyne's third wife following the murder of his second wife, Diane Kyne, in 2010. While specific details about her early life are private, public records and true crime discussions confirm key aspects of her life and her connection to Bill Kyne.

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• Full Name: Tonya Grass Kyne (also referred to as Tonya Grass)
• Role in William Kyne's Life: Third Wife and Business Director
• Marriage to William Kyne: Occurred sometime after 2010 (following Diane Kyne's murder)
• Date of Death: July 22, 2017
• Cause of Death: Cancer
• Professional Role: She served as the director of William Kyne's new business following his second wife's death.
• Residency: Seminole, Florida area (where the Kyne family resided)
• Context: Her death was the third time a wife of William Kyne's had passed away, though hers was due to natural causes.

The Relationship: From Business Partner to Third Wife

The relationship between Tonya Grass and William Kyne appears to have begun in a professional capacity. Following the highly publicized murder of Diane Kyne in 2010, William Kyne, who was a person of interest in the case, transitioned into a new phase of his life, which included writing and business ventures.

A Professional and Personal Connection

Tonya Grass was not only Bill Kyne's partner but also the director of his new business. This professional proximity likely led to their personal relationship. Kyne, who is also a Christian author, wrote a touching memoir titled *Love That* where he recounts the love he found and lost with his three wives: Kris (Krista), Diane, and Tonya. This memoir, published after Diane's death, serves as a public testament to his feelings for Tonya and the central role she played in his life during a period of immense personal and legal scrutiny.

Their marriage took place after 2010, the year Diane Kyne was strangled to death in the couple's Seminole, Florida, home. The exact wedding date remains a private detail, but their union marked a fresh start for Kyne, who was struggling with public suspicion and the loss of his second wife. Tonya provided support and a new sense of stability in the wake of the tragedy that had consumed his life.

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Life Under the Shadow of True Crime

To marry William Kyne was to step into the glare of a high-profile true crime case. Kyne’s stepson, Kevin, publicly accused him of Diane’s murder, and the case has been featured prominently on shows like NBC's Dateline. Furthermore, Kyne's first wife, Krista, was also found dead in the same home in 2000, though her death was ruled natural.

Tonya's life with Bill Kyne was, therefore, lived under an immense cloud of public suspicion and scrutiny. Her presence in his life was often discussed in true crime forums and articles, with many questioning the circumstances of the third marriage given the controversial history. Despite the pressure, Tonya remained by his side.

The Tragic End: Tonya Kyne's Death in 2017

The life of Tonya Kyne came to a tragic end on July 22, 2017, when she passed away after a battle with cancer. Her death was a devastating blow to William Kyne, who had already endured the loss of two previous wives.

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A Battle with Cancer

The cause of Tonya's death is widely reported as cancer. While the specifics of her illness are not public knowledge, the fact that she succumbed to a long-term disease distinguishes her death from the highly suspicious circumstances surrounding Krista and Diane. This detail is a critical point in the overall narrative of William Kyne's life, as it provides a clear, natural cause for this third loss.

Her passing led to a renewed, albeit brief, wave of media attention. For true crime followers, the fact that a third wife of William Kyne had died, regardless of the cause, was seen by some as an eerie continuation of his tragic fate. However, law enforcement and public records confirm that Tonya’s death was not part of the ongoing investigation into Diane Kyne’s murder.

William Kyne's Continuing Controversies

Tonya's death left William Kyne a widower for the third time. In addition to the controversy surrounding the deaths of his first two wives, Kyne has also faced legal troubles, including multiple convictions for driving under the influence (DUI), which led to the permanent revocation of his Florida license in 2014.

Despite the controversies, Kyne has maintained his innocence in the murder of Diane Kyne. His memoir and public statements emphasize his faith and the love he had for all three women in his life. Tonya Kyne's role as his third wife and business director, and her eventual death from cancer, represents the final known relationship in a life that has been inextricably linked to tragedy, suspicion, and the relentless spotlight of the true crime world.

The story of Tonya Kyne is a reminder that even in the most sensational true crime narratives, there are individuals whose lives are marked by personal struggles and natural tragedies, separate from the overarching mystery that defines the public's perception of their spouse.