A man fatally attacked at a train station in Melbourne's west on Saturday night was a cousin of the woman found dead at a hotel buck's party last month.

Marcus Rowley, 24, had returned from his cousin's Perth funeral only three days before he was attacked at Tottenham station in West Footscray.

Australian soldier Natasha Rowley was found dead in the shower of a Melbourne serviced apartment on July 16.

As police on Monday took a 35-year-old Avondale Heights man into custody over the death, Mr Rowley's former partner revealed the tragic family connection.