According to Randolph, Underwood admitted to the texts and tracking device.
She also states that he sent texts pretending to be a victim of an anonymous stalker, as well as sent anonymous texts himself.
Randolph alleges that Underwood planted a tracking device on her car as well as sent unsettling texts, which she says accuse her of hanging out with an ex.
According to legal documents obtained by TMZ, Cassie Randolph filed for a restraining order against Colton Underwood on Friday, September 11 in Los Angeles, claiming that Underwood has been stalking and harassing her.