Jack Sepple, 23, has confessed to killing 19-year-old Ashley Wadsworth, from Vernon in British Columbia, at a property in Chelmsford in February after the pair met on a dating app.
Police were called to an address in Tennyson Road just after 4pm on 1 February after receiving reports of a disturbance.
Despite the best efforts of paramedics, 19-year-old Ashley Wadsworth was pronounced dead at the scene.
At an inquest hearing, it was ruled that Ms Wadsworth died from "stab wounds to the chest".
In a short hearing held at Chelmsford Crown Court, Sepple's barrister confirmed his client was fit to plead after undergoing a psychiatric assessment.
Christopher Paxton QC, for Sepple, said that the "issue of fitness is now resolved" and requested that the defendant was asked to enter his plea. The court clerk read the single charge of murder, and Sepple, who was wearing a long white sleeved top, showing tattoos on his hand and face, simply replied: "I'm guilty."
Judge Christopher Morgan told the defendant: "By your plea of guilty to murder there's only one sentence that can be passed and that's a life sentence." Sepple was remanded in custody until a date is agreed for sentencing.
The victim only moved to Chelmsford in November 2021, before being stabbed to death in February 2021.