Woman complained about her marriage to detective husband shortly before he killed her, their youngest daughter and himself at Bay Area home, grieving friend says

DAILYMAIL.COM • 1h ago

By LAUREN ACTON-TAYLOR, US NEWS REPORTER 02:38 13 Oct 2026, updated 03:13 13 Oct 2026

A close-friend of a murdered former deputy police chief in San Francisco revealed the wife had complained of her troubled marriage before her husband shot and killed her, their daughter and himself.

Ann Mannix, 65, was found shot and killed alongside her husband Kevin Mannix, 68, and their youngest daughter, 24-year-old Katie, on Sunday evening.

Police responded to their $2 million family home in the Strawberry neighborhood of Mill Valley at around 5pm and found the bodies of all three family members inside.

The Marin County Sheriff’s Office said their preliminary investigation determined the incident to be a suspected murder-suicide by a male gunman.

A close family friend revealed that Ann, who they had known for over 60 years, had been complaining of her relationship turmoil with Kevin before the tragedy unfolded.

‘We talked about her relationship with her husband,’ she told the California Post. ‘It wasn’t great.’

However, to their knowledge, the couple weren’t estranged.

‘We were best friends. We were playmates. We learned everything together,’ she continued, adding that the Mannixes’ horrific death took her by surprise.

‘I can’t imagine having that happen or doing that,’ she continued.

‘[Ann] was a wonderful mother. She had high hopes of being a grandmother soon. You know, she was a friend to everybody.’

The friend described their daughter Katie, who was studying to be a nurse, as ‘fun, silly, the life of the party.’

Katie’s cousin, Brendan, wrote on Facebook that Katie ‘had her whole life ahead of her.’

‘She was so close to following in her older sister Lauren’s footsteps and becoming a nurse. Katie was the kind of person who would send you a random text just to say she loved you or to give you encouragement when you needed it,’ Brendan wrote.

‘She had such a big heart and a way of making people feel special. It hurts knowing she won’t get to live out the dreams she was so excited about.’

He described his aunt Ann as a ‘pioneer’ in the SFPD and someone who ‘looked out for the women coming up behind her and helped open doors for them.’

‘I’m so proud of what she accomplished and the example she set. Getting to serve as a San Francisco police officer alongside members of my family was one of the greatest honors of my life. I’ll always treasure that,’ he wrote.

‘I know I’ll carry this loss for the rest of my life. Aunt Ann and Katie, I love you both and miss you more than I can say. I find comfort knowing our Lord and Savior is holding you in His arms, free from pain and suffering.’

A former colleague of both Ann and Kevin recalled that Kevin appeared as the sort of person incapable of committing such a violent act.

‘He was very, I don’t know how to say it, but vanilla,’ retired captain Alexa O’Brien told the outlet.

‘They were an interesting couple. She had to be like six inches taller than him, and he was little. If anybody was to look at a tough person, you’d look at Ann as the tough one. That’s just how I viewed them.’

O’Brien continued on to say that Kevin wasn’t a ‘Type A personality kind of guy.’

‘When he would talk to us police officers, or if I took a class and he spoke in the class, there wasn’t anything that would strike me or give me any indication he would ever do this.

San Francisco Police Chief Derrick Lew shared a message with the department announcing their deaths on Sunday, KGO reported.

‘It is with heavy hearts that we share the news of the passing of Ann and Kevin Mannix,’ Lew wrote.

‘Please keep their family in your prayers. BSU is available to all members who may need it during this difficult time.’

The San Francisco Police Officers Association issued a statement on Monday saying the ‘suspected murder-suicide has left our entire SFPD family reeling.’

‘Ann Mannix was a trailblazer in our department – becoming the first woman to join and lead the SWAT team, and rising to lead both the Field Operations and Special Operations Bureaus,’ the association wrote on Facebook.

‘Many worked alongside Kevin during his 27 years of dedicated service at Taraval Station and beyond.

‘To see their lives, and the life of their 24-year-old daughter Katie, end in such a horrific and senseless manner is a burden that weighs heavily on every officer, active and retired.’

Kevin retired from the SFPD in June 2018 after 27 years of service.

‘I am looking forward to a new life of leisure with family and friends. But I am a little saddened by the thought of not seeing all of you every day or at community events,’ he wrote in a letter to the Taraval Police Station at the time.

‘I will miss you all. Believe me, that is not a trite generalization… I leave the SFPD, but I am taking your friendships with me forever.’

Records show Ann served as deputy chief of the SFPD Field Operations Bureau in 2018, then led the Special Operations Bureau in 2019.

The Daily Mail has contacted the Marin County Sheriff’s Office for more information.

Labour’s new ‘£9bn’ stealth tax raid: Hated freeze on thresholds set to hammer Brits even harder as…

Katie Price tells court she confronted ex Kieran Hayler over claims he raped girl, 13, and asked if…

Witnesses screamed at man to ‘play dead’ before he was mauled to death by tiger at Yorkshire zoo -…

Tiger attack witness reveals victim asked her to take his picture moments before he jumped into the…

Saudi Arabia’s terrified Crown Prince MBS ‘is moving between heavily guarded palaces with bunkers as…

Nato chief warns his forces will destroy ‘anything and everything’ if Putin is ‘foolish enough’ to…

Family discover daughter, 15, is alive in her coffin during wake

Harry and Meghan’s new life as ‘private citizens’: Sussexes will make first joint public appearance…

Student carried out a ‘cold-blooded execution’ of university housemate by ‘ambushing him and…

Burnham says Brexit ‘not good enough’ as he vows to cosy up to EU at next month’s summit – as…

Boris Johnson suggests Burnham is LYING about Russian interference in EU referendum – as No10…

‘When everything was falling apart, Carole was the one’: ROBERT JOBSON reveals how Prince William…

British woman is left stranded in Greek hospital with £10,000 medical bill after breaking her back…

Passenger jet makes emergency landing after power bank bursts into flames

NADINE DORRIES: Meghan has started a media war – here’s how Kate can win it

Mother-of-six, 46, lost her legs, hands and lips after hysterectomy went badly wrong, $68m lawsuit…

Woman complained about her marriage before husband’s murder-suicideComments are subject to our House rules and TermsNewest{{#isModerationStatus}}{{moderationStatus}}

No one seems to have shared their thoughts on this topic yetLeave a comment so your voice will be heard first.

{{upVotes}}{{downVotes}}{{#replies.comments}}{{^isLast}}{{initials}}{{userAlias}}, United Kingdom, {{formattedDateAndTime}}{{message}}

{{upVotes}}{{downVotes}}{{/isLast}}{{#isLast}}{{initials}}{{userAlias}}, United Kingdom, {{formattedDateAndTime}}{{message}}

{{upVotes}}{{downVotes}}{{/isLast}}{{/replies.comments}}{{/replies.totalCount}}{{^replies.totalCount}}{{initials}}{{userAlias}}, United Kingdom, {{formattedDateAndTime}}{{message}}

{{upVotes}}{{downVotes}}{{/replies.totalCount}}{{/isComment}}The opinions and views expressed in the comments section are solely those of the individual users and do not represent or reflect the opinions, views, or positions of MailOnline. MailOnline does not endorse, support, or verify the accuracy of any user-generated content.Terms|Privacy|FeedbackOldest{{#isModerationStatus}}{{moderationStatus}}