A fatal shooting of four people at a Central Texas apartment complex began with an argument between the gunman and his girlfriend, investigators said.
Bastrop police on Wednesday said Alejandro Martinez and Erica Rodriguez had a "verbal disturbance" in an unknown dispute when he opened fire with a rifle.
Police say Martinez on Saturday night shot and killed Rodriguez, her friend Paula Nino and his 3-year-old son, who was being carried by Nino. Nino's 2-year-old daughter had minor injuries.
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Police say Martinez then fatally shot himself.
Authorities did not immediately release further details on the youngsters.
Bastrop is 35 miles southeast of Austin.