Police identified the suspect as Naoki Yosomiya of Showa university, who allegedly beat the woman, 19, before jumping out of the window of the 5th-floor hotel room.
He was found unconscious on the sidewalk of the hotel which is near JR Uguisudani Station. He has been in hospital since the incident, the online quoted Sankei Shimbun as reporting.
Upon his recovery this week, police arrested him.
According to police, the incident occurred on December 18 when a hotel employee called police after hearing a man and woman arguing and a woman's scream coming from the room at around 8.30 pm.
When police knocked on the door, which was locked, a man inside called out to them to wait a minute. When police got into the room, the man had jumped from the window.
The woman was unconscious and had bruises all over her body. She died the next day in hospital.
Police said Yosomiya, who lives in Funabashi, Chiba Prefecture, has admitted to assaulting the victim, who worked for a call girl establishment, but denied intending to kill her.