One incident involved a woman who died after being hit near Cypress Station, authorities say.
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It happened in the 100 block of FM 1960 W around 7:30 p.m.
Investigators with the department's vehicular crimes division were on the way to that scene, according to the sheriff's office.
Meanwhile, Gonzalez reported a separate crash on Twitter at 3299 Crosby Freeway near Krenek Road in which two people were also hit by a vehicle that fled the scene.
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One of the two victims later died. A Harris County captain said the suspect, who is 87 years old, was found two miles away.
"[He or she] seemed confused and was transported for medical care," wrote the captain on Twitter.