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Arizona Senator Kyrsten Sinema Faces Lawsuit Over Alleged Affair

Aug 26, 2026 •Politics

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Former Arizona Democratic Senator Kyrsten Sinema faces a new legal storm. She is set to testify in person this month about her relationship with a married bodyguard after his ex-wife sued her. The case has everyone talking. It could end up as a made-for-TV moment on national screens.

Heather Ammel filed the lawsuit last year. She calls Sinema a deliberate interferer who seduced her husband, Matthew Ammel. That man is the father of Heather's three children. They share nearly 15 years of marriage that was shattered by this alleged affair. The documents call it a malicious act.

Heather wants money. Her claim asks for damages over $25,000 directly tied to the harm caused. She also seeks punitive damages. But the real danger lies elsewhere. Matthew Ammel lived in North Carolina when the infidelity happened. That state is one of just six in the US that still allows spouses to sue for cheating under specific circumstances.

Think of it as a 19th-century relic that has not gone away. It often finds sympathy from jurors who hand out massive payouts. Recent cases brought there under the 'Alienation of Affection' tort have produced millions. Jurors pile on dollar signs and emotional compensation like never before.

'I keep waking up during my sleep and reaching over for your arms to hold me,' Sinema wrote to Ammel in June 2024. The text appears in the complaint. It was sent via Signal around the same time Matthew allegedly stopped wearing his wedding ring.

Are you having an affair with my husband?' Heather asked in response, according to the filing. You took a married man away from his family,' she added. These words paint a picture of pain and betrayal that drives the legal action forward.

The court documents lay out a timeline spanning months. They include phone calls, emails, and Signal messages. Meetings occurred across several US states. The pair traveled to Sonoma County and Miami. Yes, they even attended a Taylor Swift concert there. Heather went along with them. On one trip, Sinema offered to work on Ammel's back with a Theragun. Another time she allegedly suggested he bring MDMA on a work assignment. She said she would guide him through the experience.

Sinema denies those specific claims. Her lawyers have not denied that the affair took place. The fight now turns to jurisdiction. Did it happen in North Carolina? That is the question that determines whether the Alienation of Affection law applies.

Former senator Kyrsten Sinema watches Matthew Ammel, her former bodyguard, with whom she had an affair, testify before the Arizona legislature in February 2024. Now she faces the music in a different courtroom. If the lawsuit proceeds, the payout could be huge. And the public eye is watching closely.

Kyrsten Sinema and Heather Ammel first became intimate in May of that year. Footage shows Sinema walking across the floor to meet Senator Chuck Schumer inside the US Senate, where she also addressed her colleagues before speaking at the capitol.

Heather Ammel's legal team made a specific argument during the proceedings. They claimed sufficient communication occurred while their husband was still physically located in North Carolina. In a written declaration, Ammel stated she remained at their marital residence when Sinema sent a photo of herself wrapped in a towel. She recounted standing in their kitchen as she read that message.

Plaintiffs suing under alienation of affection laws face a steep hill to climb. First, they must prove their marriage possessed real affection and functioned as a viable relationship before any third-party interference entered the picture. Second, they need to demonstrate that love and affection within the marriage were destroyed or significantly diminished. Finally, they must show the defendant directly caused that destruction of marital love.

The complaint filed against Sinema accused her of engaging in intentional and malicious interference with Ammel's marriage. Lawyers sought $25,000 in damages resulting from what they described as willful and wanton conduct, along with punitive damages for their client.

History offers similar examples of these lawsuits landing big verdicts. In 2010, a jury in North Carolina awarded Cynthia Shackelford a total of $9 million in compensatory and punitive damages against her husband's alleged mistress. More recently, in 2018, a Durham County judge ordered roughly $8.8 million paid to BMX show owner Keith King from the man he accused of stealing his wife and ruining his company.

Neither Sinema nor her representatives responded to requests for comment from the Daily Mail. The case hinges on whether the emotional bond between Ammel and her spouse was truly broken or merely strained by a brief moment of digital contact while abroad.

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