The disputed paternity of this person's  son, Florado Helios, led this person to murder Major Harry Larkyns, but he was not punished because his case marked  the last time that an admitted murderer was freed on (*) "justifiable homicide" in California.
This person, who signed early works as Helios, suffered from erratic behavior that may have been brought on by brain  injuries from head trauma suffered from a horrific runaway stagecoach accident. The disputed paternity of this person's  son, Florado Helios, led this person to murder Major Harry Larkyns, but he was not punished because his case marked  the last time that an admitted murderer was freed on (*) "justifiable homicide" in California. He used trip wires to depict  Sallie Gardner in an experiment commissioned by Leland Stanford. For 10 points, name this man who invented the zoopraxiscope  to put to rest the vexing problem of how many legs a horse had on the ground while galloping.
This person, who signed early works as Helios, suffered from erratic behavior that may have been brought on by brain  injuries from head trauma suffered from a horrific runaway stagecoach accident.
Eadweard [James] Muybridge [or Edward James Muggeridge; or Eduardo Santiago Muybridge]