A woman found dead with her ex-boyfriend, a former Bandido bikie, warned if she was every hurt or killed it would be at his hands, her mother alleges.

Shelsea Schilling and Bronson Ellery, 24, were found dead at a Gold Coast unit on Friday afternoon just hours after Ms Schilling's mother Bonnie Markwell Mobbs reported the 20-year-old missing on Facebook.

Police have refused to comment on the pair's identity however the heavily tattooed Mr Ellery was reportedly known to them as "Lizard Man".

Mr Ellery posted multiple photos of him with Ms Schilling on his Twitter account "Solitary Son" in November last year.

He also used the account to spruik his music career, his former links to bikie gangs and post photos of himself posing with guns.

Ms Mobbs lashed out at Mr Ellery on Facebook on Saturday for taking his and Ms Schilling lives, however police said there is nothing to suggest the deaths were a murder-suicide.

"Bastard had no life took his and my baby girl. Rott in hell Bronson. Let my angel be safe," Ms Mobbs said.

In a separate post, Ms Mobbs alleged her daughter was "scared for her life" and predicted Mr Ellery would be responsible if she ever got hurt or died.

"I'm sorry to be so negative but I want everyone to know that if I get hurt or die Bronson Ellery is responsible or (another man) doing his dirty work," Ms Schilling allegedly wrote.

"I've have seen first hand what they do and would never post this for attention.

"To all the girls suffering from domestic violence please speak up. Be brave, because at any moment anything can happen."

Ms Mobbs claimed her daughter wrote the comments when Mr Ellery was in jail.

National domestic violence helpline: 1800 737 732 or 1800RESPECT. In an emergency call triple-zero.

Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.

Suicide Call Back Service 1300 659 467.

MensLine Australia 1300 78 99 78.

Multicultural Mental Health Australia www.mmha.org.au.

Local Aboriginal Medical Service available from www.vibe.com.au.