Well, of course. But it is the burden of the evidence that has to be refuted. Because otherwise it’s pretty clear -This is incorrect, the defendant doesn’t have to prove anything. The burden of proof of guilt lies squarely on the prosecution.
RA is placed on the bridge at a time when the girls are abducted and murdered. This is established by correlating witness statements, video of his vehicle and video of a person dressed precisely like him. In addition, a cartridge with markings from a gun just like his is found between the bodies of the victims.