Days before a Gold Coast man bludgeoned his ex-girlfriend with a tomahawk and jumped on her stomach to kill their unborn child he told co-workers he would murder her.

Brock Wall bashed Brazilian woman Fabiana Palhares at her Varsity Lakes home as she screamed for help down the line of a triple-zero call on February 2, 2015.

35-year-old Fabiana Palhares was murdered with a tomahawk by her partner on the Gold Coast. Credit:Facebook

The 38-year-old was on Monday sentenced in the Brisbane Supreme Court to concurrently serve two terms of life in prison with a 20-year non-parole period.

"The facts are chilling, horrific, and the stuff of nightmares," Justice Ann Lyons told the court.