(CNN) -- A sixth person has died after a shooting in a townhouse in Santa Clara, California, police said Monday.
Police found five people, including two children, shot to death Sunday night in the townhouse.
A female toddler died overnight from gunshot wounds, said Lt. Phil Cooke of the Santa Clara Police Department.
An adult female remains in the hospital Monday in critical condition with gunshot wounds, Cooke said.
Police were called to the scene after a neighbor noticed an injured person outside the home around 8:30 p.m. (11:30 p.m. ET) Sunday, Cooke said. When police arrived, other victims were found inside.
The shootings are thought to be part of a murder-suicide, with the shooter believed to be one of the dead, according to Cooke.
The names of the victims are being withheld as the investigation continues.
CNN's Janet DiGiacomo contributed to this report.