Officers said the driver, who was in a small white sedan, took off without helping.
One victim said the Houston-area couple coerced her into buying a luxury vehicle and renting a mansion for them.
Houston police said a hit-and-run suspect was arrested and charged after being accused of punching a 90-year-old woman in the face on the Southwest Freeway at Westpark.
"He was one of a kind. I mean, to know him, you have to love him. He was an easygoing person," the victim's niece said. The victim suffered severe head trauma, slipped into a coma, and was not expected to recover.
Court documents reveal that the suspect struck the 80-year-old man during an argument about a parking spot on Friday.
Authorities say a man, possibly is his 80s, is in critical condition after suffering a severe head injury during a robbery attempt. Officials say the suspect fled the scene in a Ford F-150 truck.