"(Her sister) heard the sound of the phone falling to the ground and heard some voices", Detective Inspector Andrew Stamper told reporters.
The 20-year-old suspect, understood to be a self-described aspiring songwriter and rapper, was being questioned by police on Friday night as Ms Maasarwe's father spoke of his "special girl" at a vigil in Melbourne.
The place where Ms Maasarwe's body was found early Wednesday morning is now a growing memorial.
"Our presumption is that this was a random attack and opportunistic", he said.
Police would not confirm reports they were investigating a sexual assault but said known sex offenders are an "active line of inquiry".
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Djokovic won in straight sets 6-3, 7-5, 6-4, finishing close to 1am. "I think I've been serving really, really well the last couple days".
"I know the police will do their job and they'll deal with it", he told reporters in Fiji.
Police found a black baseball cap with "1986" written on the front, and a grey and black T-shirt, which are believed to be linked to the murder.
"There will be someone out there who has seen a person wearing this clothing, and we really need them to come forward and provide us with that information", Stamper said, according to the release.
The death of an worldwide student murdered just moments after getting off a tram in Melbourne's north has sparked a series of vigils in her honour and against male violence.
Organiser Megan Bridger-Darling said she was heartened by the turnout to the event.
"All the time she think positive, she happy".
One of her classmates, who asked not to be named, also told the publication that Maasarwe had asked him and some other classmates to attend the show with her but he wasn't able to attend.
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For the Detroit Lions, Murray opting to at least test the National Football League waters is a good thing. Barkley, 21, ran for 1,307 yards and 11 scores on 261 carries in 16 games this season.
"She liked to study different cultures, different nationalities".
"I'm just appalled at what's been happening to women overall", he said.
"The safety and wellbeing of our students and staff is of paramount importance and we are providing every possible support following this tragic incident". We didn't believe it.
Aiia Maasarwe's father has arrived to identify the body, which the Israeli embassy said it would assist with returning to Israel.
"Those scars are what connect me and her, they are what teach me, what give me strength, what allow me to hold the confusing mishmash of emotional chaos together and survive, not without her, but with her loving guidance and formidable strength".
Police are looking for at least one attacker.
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And for many TSA agents, including those in Burlington, Friday was the first time they didn't see a paycheck due to the shutdown. The agency is working with airports and airlines to consolidate operations and get the most out of resources, Gregory added.