The unnamed woman has not been charged.
London also shared rare photos of the couple's 2-year-old son as she mourned the loss of her love in a heartbreaking post on social media.
The memorial was held in front of the late rapper's store in the Hyde Park neighborhood of Los Angeles.
The TV personality posted several clips of the controversial doctor on Instagram, calling the story "unfinished king business."
Their love was solid.
Rihanna wrote, "I’m so sorry this happened to you."