The Latest on the stabbing death of a toddler in Los Angeles (all times local):

7:30 a.m.

Los Angeles police say they have arrested a 22-year-old man on suspicion of stabbing his live-in girlfriend and her 2-year-old daughter in their home, killing the little girl and critically wounding her mother.

Officials said at a news conference Tuesday that the arrest came following a tip from the suspect's father. The suspect has not been named.

Investigators believe the man is the child's father. They say the stabbing followed an argument.

Officers responding to a call late Monday found both victims with multiple stab wounds on the floor of the home near downtown.

The toddler died at a hospital. Her mother remains hospitalized in critical condition and is unable to talk to detectives.

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6 a.m.

Los Angeles police are searching for a man they say stabbed a woman and her 2-year-old daughter in their home, killing the little girl and critically wounding her mother.

Officer Liliana Preciado says officers responding to a call late Monday found both victims with multiple stab wounds on the floor of the home near downtown.

The toddler died at a hospital. Her mother remains hospitalized Tuesday in critical condition.

Preciado says the suspect is described as a man in his 20s.

Detectives have not determined a motive.