Casey Johnson died of diabetic ketoacidosis, according to the Los Angeles County Department Coroner's office in a report released Thursday.
The autopsy was performed on Johnson on January 5th, but the coroner had to await results of toxicology tests before making his ruling official. The coroner states the manner of death was natural causes.
Johnson's body was discovered at her Los Angeles home on January 4th, it is believed she had been dead for several days.
Johnson had struggled with diabetes since childhood and was supposed to give herself regular insulin injections, something she often forgot to do, according to her fiance reality TV star Tila Tequila.