Sounds like a possible love triangle.

"A sheriff's deputy has turned himself in after allegedly fatally shooting a married couple at a home in California, authorities said.
The sheriff's office had warned that the suspect -- identified as 24-year-old Devin Williams, Jr. -- was at large following the shooting, prompting a statewide manhunt, and should be considered armed and dangerous."

https://www.msn.com/en-us/news..../crime/married-coupl