Daniel Billings appeared via audio-video link in Forbes Local Court, in central western NSW, on Friday morning to enter the plea.
The 30-year-old, who is in custody in the supermax wing at Goulburn jail, also admitted four other charges including breaching an apprehended violence order, property damage and animal cruelty.
Another 12 charges, including several sexual assault and stalking offences, were dropped in exchange for the murder plea.
Billings appeared on screen from jail for the first time in over a year of court proceedings, wearing prison greens with dreadlocked hair and a small moustache.
Billings spoke only to confirm he could hear the proceedings, while his Legal Aid solicitor Diane Elston confirmed the plea.
"Yes, Your Honour," Billings said, acknowledging Magistrate Michael Maher.
Ms Ticehurst's mother sat in court watching the plea with her hand over her mouth.
About 50 Forbes locals gathered in the park outside the courthouse to support the Ticehurst family, some wearing t-shirts saying: "She matters".
The crowd burst into applause when Ms Ticehurt's family emerged from the court.
Her bereaved father Tony Ticehurst became emotional when asked how he would remember his daughter.Â
"I would break down trying to tell you," he told reporters.
"Every week I'm thankful for the support from the people of Forbes.
"But today is a special day and I really appreciate the support from the people of Forbes and surrounds and all my friends."
Ms Ticehurst, a 28-year-old childcare educator, was found dead from stab wounds in her home at Forbes in the early hours of April 22, 2024.
Billings was freed on bail by a local court registrar a fortnight before the murder, despite being charged with several counts of raping Ms Ticehurst and domestic violence offences.
Police had taken out an interim apprehended violence order against Billings on Ms Ticehurst's behalf.
The pleas came more than 18 months after Billings was charged with murder, following a mental health assessment and lengthy legal negotiations.
The last time the case was adjourned on November 3, Ms Ticehurst's father said the delay had caused their family further distress.
"It seems to me that in life, the system let Molly down and in death continues the same route," Mr Ticehurst told reporters.
"Instead of getting closure, all we get is anxiety, sadness and heartache."
Ms Ticehurst's murder intensified a national campaign against domestic and gendered violence.
The movement sparked changes to NSW laws, including stripping registrars of the power to grant bail, "show cause" thresholds for domestic violence-related bail applications and electronic monitoring for accused people.
The matter was adjourned for arraignment in the NSW Supreme Court on December 12.
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