A 25-year-old man is accused of sexually assaulting his underage female cousin and murdering her mother and grandma in Houston late Wednesday and early Thursday.

It began around 11 p.m. Wednesday when police were called after someone found a body outside the building of a since-closed bank on Houston’s northwest side. A custodian who works at a business next door told officers she heard gunshots about 9:30 p.m. When her son came to pick her up around 11 p.m., he found the body and called police. Cops responded to the scene and found the body of a 66-year-old woman suffering from multiple gunshot wounds and other injuries. It appeared she had been dumped in the parking lot, Houston police Sgt. Ben Beall told reporters.

Video showed the suspect vehicle was a white Chevrolet pickup truck with blue collapsible boxes in the back. Detectives were investigating when they received another call around 2:50 a.m. from a 12-year-old girl saying her cousin had shot her grandma and mother at a home about four miles from the original crime scene. When officers arrived at the home, they saw the same pickup truck that had been seen at the abandoned bank, Beall said.