ABANDONED. Thriller set in U.S. Male cop has a breakdown, becomes insane, shoots his (ex)wife and family with a gun.

[Carol]

Sorry, not much info, but : set in USA. Cop has a breakdown/becomes insane.
Has gun that uses 'red dot' target and shoots his (ex) wife and family.

Thanks!!

[Lobstergirl, au gratin]

Carol, please add some plot details to your header/title. This will help your query get solved faster. We also need to know when you read the book.

[Kris]

Carol, I added plot details to the topic header. Feel free to update it using the small "edit" link beside your header - on the full desktop website, not the mobile app.

Around what year did you read this book? This will help narrow down the search.

What triggers the cop's breakdown?

Are you saying you're not sure if it's his wife or ex-wife?

Location - which U.S. region, big city/small town?

[Lobstergirl, au gratin]

Carol, still looking or did you find this?

[Kris]

No response, moving to Abandoned folder.

Carol (OP) was last active on the site in September 2020.