According to the police, Mr. Takano used a survival knife to stab Ms. Sato in the head, neck and torso while she stood looking into her cellphone camera on a busy street. Ms Sato, a live streamer with more than 2,600 followers, was filming herself as she made a circuit of major train stations. Although efforts were made to revive her, Ms Sato died after arriving at a hospital, police said. [...] The police said that they believed this was not a random attack. They said Mr. Takano appears to have been a follower who said he once lent Ms. Sato a large sum of money that she never repaid. The police said this may have led Mr Takano to hold a grudge against Ms Sato. While she didn't disclose beforehand where she would be streaming from, Mr Takano tracked her down by recognizing the buildings behind her, according to local media reports citing police investigators. The aftermath of the attack was also captured elsewhere online, as passers-by posted photos on social media of Ms Sato lying collapsed and bleeding on the street.