Adrian Bayley warned his girlfriend not to walk around alone at night because it wasn't safe, after the pair watched news reports about the disappearance of Jill Meagher.
He even suggested Ms Meagher's husband Tom had done it, according to court documents.
Bayley, a father of four, has been committed to stand trial after pleading not guilty to the murder of the 29-year-old in Melbourne on September 22 last year.
The 41-year-old is accused of dragging Ms Meagher into a laneway off Hope Street in Brunswick before raping her three times and strangling her.
According to a police statement by Bayley's girlfriend tendered to Melbourne Magistrates Court, the pair were watching news reports about Ms Meagher when she told Bayley that she was shocked at how close the crime scene was to their Coburg home.
"I said, `Oh my God.' I said, `Hope Street is just around the corner from here. It's so dangerous at night, you know'," she said.
"He goes, `Yeah that's why I'm saying that this place is not safe ... don't walk alone at night, go to the gym or anything like that. No, don't walk to the gym ... take the car ...' he goes, `because you have to be safe and all that'."
The girlfriend said she and Bayley had discussions about the case after reports emerged that Ms Meagher's handbag could have been planted in the laneway.
"He goes, `Maybe it's the husband'," she said.
Mr Meagher's statement reveals he tried calling his wife seconds before she was approached by Bayley at 1.38am and texted: "Are you OK?".
He repeatedly called and texted her before leaving their Brunswick home to search for her about 4.30am - just minutes after Bayley is alleged to have driven from the laneway with his wife's body in the boot.
Police said Ms Meagher's phone records showed her phone remained in the Brunswick area until 4.24am, before moving along the Calder Freeway to where her body was found.
Her phone records mirrored those of Bayley's, police said.
According to the prosecution summary, Ms Meagher's broken SIM card was found at Bayley's home.
His girlfriend said Bayley received a bruise to the bridge of his nose on the night of Ms Meagher's disappearance, but he told her he had got into a fight with some men in the city.
A few days later, Bayley took a day off work to get his white Holden Astra put in her name, she said.
Police allege Bayley used that car to transport Ms Meagher's body to the roadside in Gisborne South, on Melbourne's outskirts, where he dug a hole and buried her.
Bayley's employment at the time was to dig holes for the lining of piping.
The girlfriend said she and Bayley went out with his work colleagues on the night of the alleged murder, but she left after they argued over his "jealousy and possessiveness issues".
Prosecutors say Bayley caught a taxi home, changed into a blue hoodie jumper and arrived at Sydney Road at 1.30am when Ms Meagher was walking along that road to get home.
CCTV footage shows a man, allegedly Bayley, running towards her.
The girlfriend said Bayley spent that weekend cleaning the Holden Astra and making sure it was roadworthy before putting it in her name.
Bayley took the car to a mechanic for repairs, where he allegedly said he wanted to replace the car's boot mat, before having all four tyres replaced, the court documents reveal.
Prosecutors allege he was trying to remove any potential forensic evidence and transfer the car into his girlfriend's name to avoid detection.