Kimberly Lynn Dow's body was discovered in a field near Jurupa Avenue and Tyler Street last Saturday.
The 30-year-old disappeared more than three weeks ago. Authorities have not released her cause of death, but they determined that it was a homicide.
Investigators said they want to interview Dow's 35-year-old boyfriend, Thomas Fulk, but he has eluded them so far.
Dow had been living with Fulk before she disappeared. She was reported missing in September by her mother.
An arrest warrant has been issued for Fulk on unrelated probation charges. Investigators said he should be considered armed and dangerous.
Anyone with information was asked to call the Riverside Police Department at (951) 787-7911.