"The no-knock warrants are going to go away like leaded gasoline in this city," Police Chief Art Acevedo said after a raid in which two suspects were killed and several officers injured.
"This is California’s money, and we are going to fight for it," said Gov. Gavin Newsom.
Authorities said they gave the suspect an antidote for an opioid overdose.
The body of Kelsey Berreth, a 29-year-old flight instructor and the mother of her fiance's infant daughter, has yet to be found.
The German designer was the creative director of French fashion house Chanel and the Italian luxury brand Fendi. He was also the director of his own eponymous brand.