"YOU'LL end up like Carl Williams," a Crown witness shot at a man accused of a double murder as she walked out of the courtroom after her expletive-ridden, outburst-prone evidence.
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Hobart woman Elisa Knight had previously stormed out of the witness box and the Supreme Court trial of Marco Daniel Rusterholz early into cross-examination on Friday.
Questions from defence counsel Evan Hughes had upset Ms Knight and she swore at him and demanded a break.
"Marco gave me f--- blood poisoning and tried to kill me," she exclaimed before she jumped out of the witness box and left the courtroom.
Ms Knight's departure forced Justice Robert Pearce to announce for the purposes of the recording that she had left the courtroom with a staff member from prosecutions.
Her volatile behaviour, swearing and shouting continued when she returned to the witness box for cross-examination and Justice Pearce asked her many times to behave.
Ms Knight called Mr Rusterholz "a bloody murderer" and later asked for a toilet break, which Justice Pearce said would need supervision.
"Did you want to come?" she quipped before he adjourned the court.
Earlier, Crown prosecutor John Ransom asked Ms Knight about what she did on August 15, 2012.
The witness said she was at the Brooker Highway house of Sally Anne Mayer, where Ms Mayer was arguing with Mr Rusterholz in the bathroom.
She said that an angry Ms Mayer left the bathroom and announced, "I did not want her f--- hair, I wanted her f--- head. "
The fourth week of the Launceston trial of Mr Rusterholz, 51, of Rocherlea, ended on Friday.
He has pleaded not guilty to the murders of Angela Maree Hallam, 31, and Joshua Eric Newman, 21, whose stabbed, burnt remains were found in a unit fire in Pioneer Parade, Ravenswood, on August 15, 2012.