Police found three men shot inside a room at the Cypress Lodge Motel in the 5600 block of Lincoln Boulevard just after 9:30 p.m.
One man was declared dead at the scene. His name has not been released. The other two victims were rushed to a local hospital for wounds to the leg and torso.
Police found Steven Matthew LeClaire at the scene and booked him for murder and attempted murder.
It's not clear yet what led to the shooting.
Detectives are actively investigating this incident as a homicide and the victim's names are not being released pending notification of their next of kin.
Anyone with information regarding this incident is asked to contact the Cypress Police Department at 714-229-6600.