San Bernardino police said Martin Luther King Daniels III, 28, died Monday about 5:30 p.m. of a wound received following an argument with his girl friend.
Brianna Jones, 25, was arrested and has admitted to the stabbing, police said. She is being held at West Valley Detention Center in Rancho Cucamonga in lieu of $1 million bail.
The couple got into an argument over relationship issues shortly after 2 a.m. Friday.
Police said Jones retrieved a knife from the kitchen and stabbed Daniels in the upper torso.