A disturbed killer who choked a man she met online with a sex toy cable should spend four years in a youth jail, a Mebourne court has been told.

Jamie Lee Dolheguy was 18 when she exchanged messages with Indian student Maulin Rathod on the Plenty of Fish app in September 2018.

Jamie Lee Dolheguy Credit:AAP

They met at her Sunbury home and he agreed to "choke-play" in her bedroom but despite his signal to stop, she kept him in a hold and whispered: "It will be OK."

She then wrapped the cable from the sex toy around his neck before calling police for help. The 24-year-old student later died in hospital.