Christopher Taylor is accused in the April 24 shooting death of Michael Ramos
Footage released last year shows Ramos had announced he was unarmed and had his hands above his head before he was shot dead in Austin
Taylor turned himself in after a warrant for his arrest was issued Wednesday
He was released on bond Thursday after it had been set at $100,000
Officer Mitchell Pieper had deployed a beanbag impact at Ramos, prompting him to try and drive away; Taylor then shot into Ramos vehicle three times